Category Archives: Mountaineering

Already an extreme sport, mountaineering at high altitudes adds exponential risk! Know before you go!

Return to High Altitude after Recovery from Coronavirus Disease 2019

Andrew M. Luks and Colin K. Grissom

https://www.colorado.com/activities/colorado-hiking

Prior to COVID-19, I would hike the beautiful mountains of Colorado known as 14ers, a name given to these mountains for being over 14,000 ft. I, like most high-altitude travelers faced the more common concerns associated with hiking such as acute mountain sickness (AMS), high altitude cerebral edema (HACE), and high-altitude pulmonary edema (HAPE). With the increase in high-altitude travel, I wondered if there are any new precautions that we should consider before resuming the activities that we love.

The purpose of this article is to highlight the recommendations for patients who wish to return to high-altitude travel after a COVID infection. Not everyone needs an evaluation after a COVID infection. The recommendations noted in this article are based on the duration and severity of the illness of each individual person.

So, who should receive an evaluation before high-altitude travel?

  1. Individuals with symptoms after 2 weeks of a positive COVID-19 test without hospitalization,
  2. Individuals with symptoms after 2 weeks after hospital discharge,
  3. Anyone who required care in the intensive care unit (ICU), and
  4. Anyone who developed myocarditis or thromboembolic events. The recommendations are to undergo pulse oximetry at rest and with activity, spirometry, lung volumes, and diffusion capacity for carbon monoxide(DLCO), chest imaging, electrocardiography (EKG), B-type natriuretic peptide, high sensitivity cardiac troponin (hsTn), and echocardiography.

It is expected that people with lower oxygen levels (hypoxemia) at rest or with exertion in lower elevations will experience greater hypoxemia with ascent to high altitude. It has been shown that ascent to high altitude causes a decrease in barometric pressure leading to a decrease in ambient and inspired partial pressure of oxygen. The decrease in partial pressure of oxygen in alveoli (PaO2) will trigger vasoconstriction of pulmonary arterioles that slows the rate of oxygen diffusion and activates chemoreceptors that increase minute ventilation from hypoxia. However, it is still unclear whether people with low oxygen levels at low elevations are at greater risk for acute altitude illness after ascent. The recommendation is to monitor pulse oximetry after arrival of high altitude.

Individuals with abnormal lung function tests don’t have to avoid high altitude travel as previous studies have shown that patients with COPD with abnormal lung functions tolerate exposure. Furthermore, in people with mild to severe COVID-19 symptoms, the lung mechanic markers such as forced expiratory volume (FEV1), forced vital capacity (FVC) and total lung capacity (TLC) normalize in up to 150 days of infection.  However, if individuals have severe limitations with exercise capacity, they should monitor their oxygen levels with pulse oximetry after ascent. Reduction in exercise capacity is possible after COVID infection and depends on the severity of the illness. Blokland et al., 2020 has shown that previously intubated individuals had a median VO2 max of 15ml/kg per min (average male 35 to 40 and average female 27 and 30), roughly 57% predicted immediately after hospitalization. 

In acute hypoxia, the heart rate increases, which leads to an increase in cardiac output. Individuals with reduced ventricular function from COVID infection do not have to avoid travel. Previous research has shown that individuals with heart failure can tolerate exercise with hypoxia. Moreover, data has shown that individuals with COVID infection maintain preserved left ventricular function and only 3% show a reduced ejection fraction. Individuals with abnormal EKG rhythms and ischemia should be referred to cardiology.  If high sensitivity troponin was abnormally elevated, this would require evaluation for myocarditis with a cardiac MRI. Knight et al., (2020), found that 45% of patients with unexplained elevations of high-sensitivity troponin were found to have myocarditis during hospitalization. It is still unclear how long these abnormalities will last and how it will affect people.

 A concerning finding on ECHO is pulmonary hypertension, as previous research has shown an increased risk in developing HAPE. A study reported that 10% of patients hospitalized for COVID without mechanical ventilation had right ventricular dysfunction for over 2 months. Several studies reported that 7-10% of individuals may have pulmonary hypertension after COVID infection. A vasodilating drug such as nifedipine can be given prophylactically if pulmonary hypertension is unrelated to left heart dysfunction but nifedipine can worsen hypoxemia.

The recommendation for patients who developed myocarditis from a COVID infection is to have an ECHO, Holter monitor, and exercise EKG 3-6 months after illness. Travel can resume after a normal ECHO, no arrhythmias on exercise EKG, and after inflammatory markers (ESR and/or CRP) have normalized. Previous studies suspected that areas with low atmospheric pressures (e.g., high-altitude) that induce hypoxia have increased risk for clot formation. However, this suspicion has never been firmly established; therefore there is no reason to believe that high-altitude will increase the risk for clot formation in individuals who developed an arterial or venous clot from COVID infection.

A few things to consider before planning a high-altitude excursion includes planning to visit areas with access to medical resources or the ability to descend rapidly. If you are new to high altitude, it is recommended to slow the ascent rate. Traveling to high elevations (>4000m) should be avoided until tolerance has developed with moderate elevations (2000-3000m). A more gradual return to physical activity at high altitude is recommended rather than immediate resumption of heavy exertion. As the pandemic subsides and with increase in mountain travel, more research will develop that can better address these risks.

Good news! The Ebert Family Clinic in Frisco, CO provides pulse oximeters for free. So, make sure to visit and grab your pulse oximeter before your next ascent.

Quick Summary of Recommendations

Individuals who require evaluation prior to high-altitude travel:

  1. Individuals who have symptoms after 2 weeks of a positive COVID-19 test without hospitalization
  2. Individuals who have symptoms after 2 weeks after hospital discharge
  3. Any patient who required care in the intensive care unit (ICU)
  4. Any patient who developed myocarditis or thromboembolic events

General recommendations for anyone before high-altitude travel:

  1. Monitor pulse oximetry after arrival of high altitude, and access care or descend if symptoms worsen.
  2. Rest and avoid high-altitude travel for at least 2 weeks after a positive test, and consider a gradually return to physical activity at higher altitudes.
  3. All individuals planning high-altitude travel should be counseled on how to recognize, prevent, and treat the primary forms of acute altitude illness (AMS, HACE, and HAPE)
  4. Limit the extent of planned exertion after ascent and, instead, engage in graded increases in activity that allow the individual to assess performance and avoid overextending themselves.

Reasons to forgo high-altitude travel:

  1. Severely elevated pulmonary artery pressures may be a reason to forego high-altitude travel altogether.
  2. High-altitude travel should likely be avoided while active inflammation is present in myocarditis.
  3. Patients who experienced arterial thromboembolic events due to COVID-19, (e.g. myocardial infarction or stroke) should defer return to high altitude for several months after that event or any associated revascularization procedures.

References:

  1. Andrew M. Luks and Colin K. Grissom. Return to High Altitude After Recovery from Coronavirus Disease 2019. High Altitude Medicine & Biology. http://doi.org/10.1089/ham.2021.0049
  2. Christensen CC, Ryg M, Refvem OK, Skjønsberg OH. Development of severe hypoxaemia in chronic obstructive pulmonary disease patients at 2,438 m (8,000 ft) altitude. Eur Respir J. 2000 Apr;15(4):635-9. doi: 10.1183/09031936.00.15463500. PMID: 10780752.
  3. Blokland IJ, Ilbrink S, Houdijk H, Dijkstra JW, van Bennekom CAM, Fickert R, de Lijster R, Groot FP. Inspanningscapaciteit na beademing vanwege covid-19 [Exercise capacity after mechanical ventilation because of COVID-19: Cardiopulmonary exercise tests in clinical rehabilitation]. Ned Tijdschr Geneeskd. 2020 Oct 29;164:D5253. Dutch. PMID: 33331718.
Image of Jesse Santana, dark brown hair, brown skin, beard and moustache with a stethoscope draped over his white coat, striped, collared shirt and maroon tie.

Jesse Santana is a second-year PA student at Red Rocks Community College in Denver, Colorado. He grew up in Colorado Springs, CO and attended the University of Colorado-Colorado Springs where he earned a bachelor’s in Biology and Psychology. Jesse worked as a Certified Nursing Assistant for two years before pursuing a Master’s in Biomedical Sciences at Regis University in Denver. Shortly after, he coordinated clinical trials in endocrinology and weight loss as a Clinical Research Coordinator at University of Colorado Anschutz Medical Campus. He enjoys hiking Colorado’s 14ers, spending time with family and friends, and camping.

Anxiety at Altitude

As I arrived in Denver (5280′), and ultimately Frisco, CO (9000′), the first physical symptom I noticed from the high-altitude environment was dyspnea on exertion. On flat ground I didn’t feel any different than at home in New Jersey, but as soon as I began to climb stairs or hike the beautiful trails in the area, I quickly became winded. I had already read about the common symptoms of high-altitude acclimation and knew this was normal and was on the lookout for headache, nausea, or dizziness. I noticed my resting heart rate was elevated and told myself this was also normal because the low-oxygen environment required my heart to work harder to keep my pulse oxygen levels up. I already owned a pulse oximeter that I had bought during my time working with COVID patients in the Emergency Room on a previous rotation. I checked that within my first week and was initially disappointed that it was averaging around 91%, but soon found out this was also normal, especially since I was still acclimating. My Apple watch trended data over time on my heart rate and I noticed a tremendous difference in my resting HR compared to home.

I landed on May 2nd, 2021 and I think the graphs above make that quite evident. My walking HR was even more noticeably elevated. “The initial cardiovascular response to altitude is characterized by an increase in cardiac output with tachycardia … after a few days of acclimatization, cardiac output returns to normal, but heart rate remains increased”1

My persistently elevated heart rate caused me to feel anxious when hiking or doing other physical activity, and that anxiety in turn raised my heart rate even more. I had experienced PVC’s in the past which occurred only a few times a month, nowhere near the threshold for treatment, and had been reassured they were totally benign. On a hike during my first week in Colorado I experienced a few of these “skipped beats” followed by rapid heart rate and had to talk myself down from the anxiety it caused. This is what prompted me to research the effect of altitude on anxiety. “Adrenergic centers in the medulla are activated in acute hypoxia and augment the adrenergic drive to the organs.”2 It seems as though the body’s compensatory mechanisms to physiological changes can be accompanied by unwanted mental health disturbances. This is especially true for people in the early stages of shifting from low altitude to high altitude. During the adjustment period individuals are most susceptible to new-onset anxiety disorders, but even those living long-term at high altitude are at increased risk of psychiatric ailments.4 In fact, living in high-altitude environments has been associated with serious mental health implications not limited to anxiety disorders, including depression and increased suicidality.4 This has been evidenced by statistically significant changes in PHQ-9 Total Score, PHQ-9 suicidal ideation, and GAD-7 Total Score.4

Sleep disturbances have often been faulted for these increases in anxiety and depression at high altitude, and although I didn’t have any formal sleep studies done while in Colorado, I felt well-rested and didn’t notice a change in my sleep at altitude.3 One hypothesis that could explain these findings and my personal experience, is that hypoxia has an inverse relationship with serotonin.4 Because oxygen is a requirement for the creation of serotonin, living somewhere with decreased oxygen could lead to deficiency. Serotonin has an expansive role in the human body, playing a role in cognition, sleep, mood, digestion and other crucial aspects of life. Low levels of this neurotransmitter have been implicated as a cause for depression and accordingly many of our best antidepressant medications like SSRI’s and SNRI’s work on these pathways. There is also a “chicken or the egg?” argument to be made. Is the anxiety brought on due to hypoxia which in turn causes somatic symptoms like palpitations, shortness of breath, and presyncope; or do these symptoms caused by hypoxia come first, resulting in anxiety and panic attacks? For example, hyperventilation, a well-known provocative factor of panic attacks, is also a response to altitude changes. Hypoxia leads to hypocapnia, which can ultimately lead to respiratory alkalosis.5 Although there are multiple hypotheses for these mental health changes, there does seem to be an agreement in the literature that they do exist.

Luckily, in my experience, my body adjusted over the span of a few weeks. My HR began to trend down towards my normal resting rate in the 70’s and my anxiety levels also dropped. I started doing more challenging hikes, traveling and enjoying the many natural wonders Colorado has to offer. Just being in amazing places like Rocky Mountain National Park and the San Isabel National Forest had a profound impact on my mood as I soaked in the scenery. I took pictures, breathed fresh mountain air and spotted wildlife, which all served to distract me from my worries. The mood-altering benefits of exercise also likely played a role in my increasing happiness. I grew to love the state and as soon as I felt fully adjusted, it was time to go back to New Jersey. Back to sea-level, outrageous humidity and hotter weather.

References:

  1. Naeije R. Physiological adaptation of the cardiovascular system to high altitude. Prog Cardiovasc Dis. 2010 May-Jun;52(6):456-66. doi: 10.1016/j.pcad.2010.03.004. PMID: 20417339.
  2. Richalet JP. Physiological and Clinical Implications of Adrenergic Pathways at High Altitude. Adv Exp Med Biol. 2016;903:343-56. doi: 10.1007/978-1-4899-7678-9_23. PMID: 27343107.
  3. Bian SZ, Zhang L, Jin J, Zhang JH, Li QN, Yu J, Chen JF, Yu SY, Zhao XH, Qin J, Huang L. The onset of sleep disturbances and their associations with anxiety after acute high-altitude exposure at 3700 m. Transl Psychiatry. 2019 Jul 22;9(1):175. doi: 10.1038/s41398-019-0510-x. PMID: 31332159; PMCID: PMC6646382.
  4. Kious BM, Bakian A, Zhao J, Mickey B, Guille C, Renshaw P, Sen S. Altitude and risk of depression and anxiety: findings from the intern health study. Int Rev Psychiatry. 2019 Nov-Dec;31(7-8):637-645. doi: 10.1080/09540261.2019.1586324. Epub 2019 May 14. PMID: 31084447.
  5. Roth WT, Gomolla A, Meuret AE, Alpers GW, Handke EM, Wilhelm FH. High altitudes, anxiety, and panic attacks: is there a relationship? Depress Anxiety. 2002;16(2):51-8. doi: 10.1002/da.10059. PMID: 12219335.

Joseph Albanese is a second-year physician associate (PA) student attending Drexel University in Philadelphia, Pennsylvania. He grew up in Hillsborough, NJ. He got his BA from The Pennsylvania State University as a double major in Psychology and Film Studies. Prior to PA school he worked as a mental health associate in an inpatient psychiatry setting with actively suicidal and homicidal patients. The acuity of the unit he worked on made him appreciate the benefits of talk-therapy, but also the crucial role of medicine in many cases. This led him to apply to PA school. In his free time Joe loves to travel (favorite places include Japan, Iceland, Glacier National Park, and now Colorado). He also enjoys photography, playing sports, and eating new foods.

Nail Abnormalities at High Altitude

With summer just around the corner, more people will be hitting the mountains for some high altitude hikes and 14ers. There have been numerous anecdotal findings of mountaineers with changes to their fingernails after ascending the world’s tallest peaks, with the most common abnormalities being Mees’ lines, Muehrcke’s lines, and Beau’s lines. While the peaks in Colorado do not compare to those of the Himalayas, there is always a chance, albeit very low, that you may notice some changes to your nails after a high altitude expedition.

Both Mees’ lines and Muehrcke’s lines are types of leukonychia, which means “white nails”. Mees’ lines present as a single horizontal white band, sometimes multiple, located in the nail plate and are non-blanching. Throughout history, Mees’ lines have been associated with drug toxicity, such as from arsenic or thallium.4 Additionally, there are many systemic diseases that have been associated with Mees’ lines in which the body is experiencing high amounts of stress, such as with myocardial infarction, sickle cell crisis, and tuberculosis.4

Mee’s lines

One case report, “Mees’ lines in high altitude mountaineering”,  by Avinash Aujayeb details how a 27-year old man developed Mees’ lines after he traversed high altitudes in the Pakistani Karakorum range, attempting to scale a summit of 7031 meters.1 He acclimated to altitude at a camp located at 4000 meters,  and stayed for a total of 21 days. No medications were used for acclimatization. In his attempt to reach the summit, he became extremely fatigued and hypothermic, and turned around at 6900 meters. Upon return to sea level, he lost about 17 pounds of weight. Six weeks after his expedition, he developed non-blanching horizontal white lines on his nails, consistent with Mees’ lines. The lines eventually moved distally and completely disappeared. While the paper does not go on to hypothesize the cause of this man’s development of Mees’ lines, it seems reasonable that they appeared due to the stress the man endured as evidenced by his need to turn around early from fatigue and hypothermia, and likely hypoxia given the extreme altitude.

Muehrcke’s lines present as a pair of horizontal white bands located in the nailbed, the skin beneath the nail plate, making them blanchable (unlike Mee’s lines which are located within the nail itself). Muehrcke’s lines usually present on the 2nd, 3rd and 4th fingers, and typically spare the thumb. Historically, these lines are most associated with hypoalbuminemia as seen in a protein-losing condition of the kidney called nephrotic syndrome.4 They have also been found in disease states of systemic immunosuppression, such as in HIV, where the metabolism of the body is stressed and has decreased ability to make proteins. 4

Muehrcke’s lines

The discovery of Muehrcke’s lines was first published in the British Medical Journal in 1956 by Robert C. Muehrcke.4  In the paper, he details a study in which he compared 750 adult patients and healthy volunteers who had normal serum albumin against 65 patients known to have chronic hypoalbuminemia.  He saw that the pair of white horizontal lines were only in those with the chronic hypoalbuminemia, most specifically those with a serum albumin below 2.2 g/dL.4 Once these patients were treated and their albumin concentrations increased, the lines disappeared after a few weeks. He thought the findings suggested that Muehrcke’s lines were from an albumin deficiency due to poor nutrition.

In a letter to the editor of High Altitude Medicine and Biology, authors Windsor, Hart, and Rodway describe the presence of Muehrcke’s lines on Mount Everest after a 38 year old with no significant medical history noticed their appearance a few weeks after he had returned to sea level.3 There were two parallel horizontal lines under the nails of his 2nd, 3rd, 4th, and 5th digits, sparing the overlying nail. They believe the development of these nail findings were indeed from hypoalbuminemia , however do not believe it was from a nutritional deficiency as Muehrcke first described, because the climber had been healthy throughout his expedition and he maintained good nutrition.3 They attribute the findings to peripheral edema, which is a common finding in high altitude mountaineers. With this edema, fluid levels in the tissues increase. The authors believe this may have inhibited the growth of the nailbed, which then resumed with return to sea level.

Another nail finding from high altitude mountaineering is called Beau’s lines, which are an indented groove across the span of the nail horizontally, beginning at the base of the lunula. The lines result when nail formation is temporarily halted during episodes of stress, and usually present several weeks after the stressful incident.2 They are generally caused by local trauma to the nail, extreme temperatures, and toxicity from chemotherapy.4

Beau’s lines

There was a prospective study completed by authors Bellis and Nickol in High Altitude Medicine and Biology where the study participants were completing a research expedition in eastern Nepal in April and May of 2003.2 The maximum altitude reached varied from 5,142 to 6,476 meters and the length of stay of each individual also varied. The study found Beau’s lines developed in 1 out of 56 participants at 4 weeks, however by 8 weeks, 17 out of the 52 (or 33%) developed Beau’s lines. The authors hypothesized that the changes were possibly due to the hypoxic as well as hypobaric environment which could diminish the activity of the nail matrix. However, they did acknowledge the fact that there were other factors that could have resulted in the Beau’s lines, such as extreme cold conditions and possible injuries to the fingers due to the nature of the work of the researchers. No participants reported frostbite or any damage to the hand, however at night temperatures dropped as low as negative 20 degrees Celsius.

Clubbed fingers

These nail abnormaltities are less likely to be found during expeditions within the United States unless hiking in Alaska, which has Denali, the tallest peak in the US at 20,310 meters. Outside of Alaska, the tallest peak is Mount Whitney in California, which pales in comparison at 14,505 meters. Most of the case reports completed on these nail findings were from several week-long expeditions in the Himalayas. However, condition you may already be aware of is clubbing of the fingers. This presents as a bulbous enlargement of the fingertips caused by chronic hypoxia. During my five-week visit here, I have anecdotally heard from two different Summit County residents that they have many healthy and young friends with clubbed fingers. Unfortunately, I was unable to find any research on the prevalence of clubbed fingers among individuals living at high elevations, but I believe it is something that deserves to be looked into deeper. 

References

  1. Aujayeb, A. (2019). Mees’ lines in high altitude mountaineering. BMJ Case Reports, 12(3), 1. doi:10.1136/bcr-2019-229644
  • Bellis, F., & Nickol, A. (2005). Everest Nails: A prospective study on the incidence OF Beau’s lines after time spent at high altitude. High Altitude Medicine & Biology, 6(2), 178-180. doi:10.1089/ham.2005.6.178
  • Windsor, J. S., Hart, N., & Rodway, G. W. (2009). Muehrcke’s lines on Mt. Everest. High Altitude Medicine & Biology,10(1), 87-88. doi:10.1089/ham.2008.1079
  • Zaiac, M. N., & Walker, A. (2013). Nail abnormalities associated with systemic pathologies. Clinics in Dermatology,31(5), 627-649. doi:10.1016/j.clindermatol.2013.06.018

Makenna Schmidgall is a second-year physician assistant student at the Midwestern University Physician Assistant Program in Glendale, Arizona. She grew up in Gilbert, AZ, but left her desert home to attend New York University in the Big Apple where she earned a bachelor’s degree in Global Public Health/Biology. During her junior year of college, she began working as an ER scribe in multiple emergency departments of the Mount Sinai Health System in New York, NY. She enjoys gardening, hiking and playing with her new Labrador retriever puppy “Piper”.  

A Summation of Wilderness Medical Society Clinical Practice Guidelines for Diabetes Management

According to recent research, nearly thirty million individuals in the United states have been diagnosed with diabetes. Due to this higher rate of prevalence, more people are aware of the basic information surrounding a diabetic diagnosis.  However, there are common misconceptions surrounding the average diabetic patient, with most information focused on the more common form of diabetes, type 2. Although the majority of diabetic patients in the United states do have type 2 diabetes, an estimated 5 to 10% of people with diabetes actually have type 1. Type 1 diabetes is an autoimmune disease in which the body’s own immune system destroys the cells in the pancreas that make insulin. Insulin is a very important hormone that enables sugar to enter the bloodstream in order for it to be used by the cells for energy, as well as stored for later use. Unlike type 2 diabetes, there is no cure for type 1 diabetes and the treatment options are limited; the only management for this form of diabetes is insulin therapy. The most common therapeutic regimens for type 1 diabetes includes constant monitoring of blood sugars using a glucometer or continuous glucose device. These devices combined with either syringes, preloaded insulin pens, and/or an insulin pump are the means to survival for type 1 diabetics. However, there have been many advancements in the ways physicians are able to help their type 1 diabetics control and manage their disease.  Because of this, type 1 diabetics are able to live their lives with far less complications.  When desired, type 1 diabetics are able to compete at high levels of activity and complete amazing feats, such as wilderness activities.

It is inspiring to know how type 1 diabetics are still able to perform in high intensity activities such as ultramarathons, ironmen/ironwomen, as well as professional sports, to name a few.  However, with such strenuous activity, it is important to note that diabetes control is more challenging.  Of note, it cannot be stressed enough, that baseline diabetic control is already challenging in itself.  By adding the addition of a strenuous environment and activity, diabetes control becomes more difficult as it is multifactorial.

To help address this issue, the Wilderness Medical Society (WMS) worked to form clinical practice guidelines for wilderness athletes with diabetes. The WMS gathered a group of experts in wilderness medicine endocrinology, primary care, and emergency medicine to compose these guidelines.  These guidelines are outlined for both type 1 and 2 diabetics who participate in mild-vigorous intensity events in wilderness environment with reduced medical access and altitudes greater than or equal to 8250ft; the objective to help individuals with diabetes better plan and execute their wilderness goals. The foundation summarizes their recommendations into pre-trip preparation, including a list of essential items to bring when on your wilderness trip, potential effects of high altitude on blood glucose control and diabetes management, and an organized algorithm to treat hyperglycemia and ketosis in the backcountry.

Effects of High Altitude on Diabetes Management:

At baseline, the various types of exercise activities are broken into aerobic, anaerobic, and high intensity exercise. Each type of exercise utilizes the energy stored in our bodies, in the form of sugar. In a healthy person without any comorbidities, during aerobic activities, glucose uptake into the large muscle groups is increased due to the increase in energy expenditure. To keep glucose higher during this form of exercise, insulin secretion is reduced. Simultaneously, other hormones such as adrenaline, cortisol, and glucagon are released into the system to promote further glucose release from processes such as gluconeogenesis and glycogenolysis.

Again, the body is utilizing its resource of glucose to move to the larger muscle groups to keep them moving and active. During anerobic and high intensity exercise, the same process occurs, but since these forms of exercise tend to be in short bursts, insulin levels tend to rise particularly in the post workout period.  This helps to diminish the effects of the counterregulatory hormones and keep blood sugar levels stable. If the athlete is unable to properly regulate insulin secretions during these various forms of exercise, then it is likely that he/she will experience frequent episodes of hyperglycemia. Also, due to the increase in insulin sensitivity in muscles post workouts lasting >60 min, hypoglycemia can also ensue.

In general, the WMS and other research demonstrates brief episodes of high intensity exercise are linked to hyperglycemia for diabetics. On the other hand, longer duration aerobic exercise will cause hypoglycemia. Unfortunately, due to the complex intricacies of glycemic control during exercise, in addition to the individuality of each patient and the multiple variables involved in each wilderness expedition (temperature, altitude, duration, etc.), the definitive guidance for adjustment of daily insulin continues to need refinement. This is why the WMS recommends extensive pre-trip planning with the various tools, research, and supplies that will be needed when planning any form of wilderness adventure.

Pre-trip Prep:

Like all endeavors, preparation is key in order to be better equipped to deal with the majority of future scenarios.  Planning is especially important when going on a wilderness expedition. Preparation becomes even more important with the diagnosis of diabetes. The WMS outlines the specific recommendations that should be included as a diabetic wilderness athlete. For example, pre-trip prep should generally include: (1) a medical screening, (2) research of the endeavor and how it may affect glucose management, and lastly (3) essential diabetes-specific medical supplies and backups.

Additionally, according to the American diabetes association, persons with diabetes should discuss with their primary care provider and or endocrinologist before a strenuous wilderness activity. This follow up ensures that athletes are up to date on their screenings, health maintenance labs, and prescriptions needed for therapy. Due to the various ways that diabetes can affect the body, the WMS also recommends that if a patient has cardiovascular involvement, retinopathy, neuropathy, or nephropathy, there should be a more extensive risk assessment by the provider. Although these complications are less commonly seen in high intensity wilderness athletes, adequate histories should be taken to avoid adverse circumstances.

As discussed earlier, altitude accompanied with increased strenuous exercise demands also has various effects on blood glucose management. As it pertains to altitude and blood sugar management in type 1 diabetes, multiple studies have shown an increase in insulin requirements at altitudes above 4000m (13,123′). At this time, researchers are unsure if this finding is due to the effects of acute mountain sickness or hypobaric hypoxia. Therefore, wilderness athletes with diabetes should be aware of the insulin resistance increase at these extreme altitudes.  In conjunction with altitude changes, as previously noted, the type of exercise will also play a role in insulin control.  Aerobic exercise for longer than 60 minutes can cause a hypoglycemic episode in type 1 diabetics due to the increased muscle sensitization to insulin. Therefore, at altitudes 4000m or above, wilderness athletes will be in a mixed long duration anaerobic/aerobic exercise. With the combination of these factors, there is a counter regulation effect, and the athlete becomes both more sensitive to insulin due to increase duration of exercise and less sensitive due to altitude demands. In order to better predict the effects of altitude combined with exercise, the WMS recommends close monitoring on shorter trips to recognize their specific glycemic trends prior to an extreme high-altitude expedition, as well as increased close monitoring of glucose management during their high-altitude endeavors.

Table 1: Environmental Effects on Diabetes, Imported from WMS

Lastly, in preparation of a high-altitude excursion, there are recommended items that should be packed for daily management of glucose, in addition to back up items to ensure athletes with diabetes aren’t left in a dangerous situation. Fortunately, the WMS was able to create a well-organized table on the recommended supplies.

Table 2: Medical Kit Preparation, Imported from WMS

Treatment of ketoacidosis or HHS:

To be properly prepared, an athlete should complete his/her own research on how changes of altitude and exercise can affect blood glucose management.  This includes complete pre-trip preparation and packing.  Once cleared, a diabetic athlete can finally head out on the high-altitude adventure. In case of emergency, a diabetic should be aware of the proper steps if he/she were to experience diabetic ketoacidosis (DKA), hyperosmolar hyperglycemic state (HHS), or even acute mountain sickness (AMS). Hyperglycemia is described as a blood glucose greater than 250 mg/dL and without adequate treatment can lead to either DKA or HHS. Type 1 diabetics are more likely to go into DKA, while type 2 diabetics are more inclined to present in HHS. One of the most important indicators if a person were to be in DKA are ketones in blood or urine. This is why it is very important to make sure a wilderness athlete carries ketone strips in his/her emergency medical pack. Typically, if a patient finds ketones in their urine after using a ketone strip, then he/she is educated to seek emergent medical attention. When on a wilderness adventure, this can be a difficult task to accomplish. This is why the WMS also developed a flowchart in order to manage hyperglycemia and DKA without medical support. Refer to table 3 for their flowchart.

Table 3: Algorithm for management of hyperglycemia and ketosis in the backcountry. EDD, estimated daily dose, PO, oral intake, Imported from WMS

One issue that diabetics have when dealing with high-altitude is differentiating hypoglycemia and hyperglycemia side effects from AMS. The most reliable differentiating factor is increased blood sugar readings correlating with symptoms. WMS states that either a continuous glucose monitor or increased finger sticks for a higher frequency of blood sugar readings is important to determine if a person with diabetes is experiencing blood sugar complications of AMS. When discussing treatment of AMS in diabetics, the same methods are used as are recommended for a non-diabetic individual: Acetazolamide and dexamethasone in initial medical management. In regard to diabetes, it is important to discuss the potential additional side effects. Acetazolamide can worsen dehydration and acidosis if used at the wrong time. Dexamethasone is known to worsen blood glucose control. Both are still useful in acute mountain sickness but must be weighed against causing worsened complications.

Conclusion:

When participating in a wilderness adventure, individuals with diabetes will be prone to more medical side effects. Changes in altitude, along with the level of activity are known to affect diabetic control, so proper preparation prior to departure is required in order to ensure the health and safety of a diabetic wilderness athlete.  After being cleared by a medical professional and obtaining proper information, diabetics can plan to complete a wilderness adventure similar to that of a healthy individual with no comorbidities.  However, it is common for diabetics to experience hyperglycemia with high intensity activities and an increase in altitude. Therefore, diabetics (particularly type 1 diabetics), should be prepared with extra insulin to counteract elevated glucose levels. Alternatively, if a diabetic were to be at higher altitude with a longer duration of aerobic or anaerobic exercise, then he/she may be prone to hypoglycemia — lower blood sugar levels.  In either case, individuals with diabetes will need to monitor blood sugar levels more closely.  The WMS provides diabetics with an outline of recommended supplies that may be needed in the wilderness.  The outline also suggests for diabetics to bring ketone strips, as this is the most accurate measurement to determine if a diabetic is in DKA or HHS.  The ultimate goal of the WMS is to ensure the health and safety of diabetic athletes. Diabetes is a difficult disease to manage but becomes even more challenging when partaking in a wilderness adventure.

(All tables and figures imported from WMS)

References:

de Mol P, de Vries ST, de Koning EJ, Gans RO, Tack CJ, Bilo HJ. Increased insulin requirements during exercise at very high altitude in type 1 diabetes. Diabetes Care. 2011;34(3):591-595. doi:10.2337/dc10-2015

VanBaak KD, Nally LM, Finigan RT, et al. Wilderness Medical Society Clinical Practice Guidelines for Diabetes Management. Wilderness Environ Med. 2019;30(4S):S121-S140. doi:10.1016/j.wem.2019.10.003

Jonathan Edmunds is a second-year physician assistant student at RRCC PA Program in Arvada Colorado. Jonathan is a Colorado native, born and raised in Littleton, CO. He attended Colorado State University in Fort Collins, CO where he competed in Track and Field as a long jump/triple jumper, as well as earned his bachelor’s Biological Sciences. During his junior year in college, he was diagnosed with Type 1 diabetes and quickly became an advocate the support of diabetes education. After graduating in 2015, he focused his medical career aspirations on becoming a PA. He volunteered at Banner Fort Collins Medical Center and work at Bonfils Blood Center as a phlebotomist for 2 years before applying to PA school. In his free time, he enjoys coaching track and field at Littleton high school his alma mater, doing all things outdoors, and cozying up to his three “Irish” chihuahuas at home. 

High Country Winter Dogs

Dr. Margot Daly DVM, CCRP, CVA, of the Frisco Animal Hospital in Frisco, CO, graduated from the University of California – Davis in 2013, and has worked in general practice, emergency practice, and most recently in specialty practice as a full-time rehabilitation and sports medicine veterinarian. Prior to veterinary school, she studied Sociology at UC Berkeley, and had a career as a professional equestrian, which led to an interest in orthopedics, biomechanics, and physical rehabilitation. Following graduation, she received the Certified Canine Rehabilitation Practitioner designation from the University of Tennessee – Knoxville, and the Certified Veterinary Acupuncturist designation from the Chi Institute in Reddick, Florida. She has been with the Frisco Animal Hospital for a year and a half, and when she is not working, she can be found riding a horse or one of her many bicycles, fostering dogs and kittens, reading books, skiing, or traveling somewhere new!

We interviewed Dr. Daly on her advice for canine high country health, winter dog gear, common winter injuries, and winter activities to participate in with your dog.

One of the most common things to be aware of is canine “weekend warrior syndrome.” Dog owners must be sure their dogs are fit enough to participate in physically intense weekend activities. Many dogs only go out in their yard or take a few short walks during the week and then go on big hikes, back country ski trips, or long mountain bike rides on the weekends. Unfortunately, during the high intensity activity the dog’s adrenaline is high and the dog won’t show signs of fatigue, yet the next day with dog will feel awful and be extremely sore. It is comparable to a human doing cross fit only once per week … [imagine] how he or she would feel the next day. To avoid this phenomenon, ensure your dog is fit enough by practicing 30-60 minutes of moderate exercise at least three times per week, which can include 30 minutes of jogging or 60 minutes of active walking. If your dog is doing less than that during the week, it is important to be thoughtful of what you are asking of your dog or what you are giving them the opportunity to do over the weekend. Unfortunately, a fun weekend can become overly taxing on your dog very quickly.

Signs your dog may have done too much over the weekend include not wanting to go up or down stairs, refusing to jump in and out of the car, or not wanting to get up or down from the couch. Your dog may not necessarily be limping since they are more likely to have general full-body fatigue, aches, and soreness. Your dog should still eat and drink normally, and if they aren’t that is reason to call your vet.  

Winter Clothing & Gear

Booties: Dog clothing can be helpful as dogs can get cold just like humans do during outdoor winter activities. Booties can be advantageous during both summer and winter activities. The best policy is to pay attention to your dog’s behavior to determine how necessary booties are. Some dogs make it clear that they are uncomfortable in the snow and slush by holding their paws high in an alternating fashion, sitting down, or refusing to walk. Some dogs are more sensitive than others and some have a higher tolerance for the cold than others.

Dog booties!

The key to booties is acclimating your dog over a week or so before taking the booties out on an adventure. The best way to do this is to put your new booties on your dog in your house and then give them a treat or play with their favorite toy. This will help reinforce the booties and make them a fun experience for your dog! This may take several days before the dog will tolerate the booties and walk around comfortably in them. Essentially, don’t wait until the morning of the big hike to put the booties on your dog for the first time. Another strategy is to start with lightweight booties made of felt with one Velcro strap. These are a lightweight cheap option and are the same booties sled dogs on the Iditarod use. It is best to buy a few sets of these to start as some will inevitably get lost. If you find that your dog requires something more substantial, Dr. Daly recommends RuffWear boots which have a heavy rubber sole. Beware these booties may cause difficulty for a dog with mobility issues where heavy booties may impair the dog’s ability to walk safely. Custom booties are also an option and are recommended for dogs with atypically shaped feet such as greyhounds. A company called TheraPaw will coordinate with your vet to get measurements of your dog’s feet and make custom booties.

If your dog is totally intolerant of booties but could benefit from them, you can try musher wax. It provides a slightly waterproof barrier between your dog’s paws and the roads. It also helps prevent ice balls in dogs with a lot of feathering on their paws or between their toes. Put the wax on right before your take your dog outside and wipe the dog’s paws as soon as you get home. This can help protect dogs who have a lot of road time to protect them from road salt, sand, and ice chemicals.

Jackets: Dr. Daly confirms that there are dogs that may benefit from a jacket especially when participating in winter hiking or backcountry skiing. If you see your dog shivering, hunching their back, or crouching their neck and shoulders, your dog is likely cold and would benefit from a jacket. When choosing a jacket, it is imperative that you choose a jacket that has a full chest and short sleeves vs one that just has a strap across the chest. This ensures that the snow will slide off the chest and not become trapped against the dog’s skin. It is hard for a dog to overheat in the winter, but it is a good idea to provide layering for your dog. Most importantly, do not choose a cotton fabric, but a fabric that will wick and dry quickly such as fleece, soft shell, or a technical fabric. If your dog’s jacket becomes wet or soaked, it is important to take it off, because a wet jacket is no longer providing warmth and will end up making your dog colder.

Goggles: There are a large number of canine patients with eye problems related to the UV light exposure at high altitude. In particular, pannus, an eye condition exacerbated by UV light, is common in dogs living at high altitude due to more UV exposure and increased UV reflection off snow. This immune-mediated condition affects the cornea and causes pink or grey granular tissue to grow from the lateral cornea toward the medial cornea. It is a type of chronic superficial keratitis that certain breeds, specifically German shepherds, are more prone to. For this reason, goggles are recommended for dogs living at high altitude especially if the dog is a high risk breed or if they are already diagnosed with pannus. Weekend warriors are at a much lower risk of developing pannus and goggles are not as strongly recommended. As with dog booties, dogs must be acclimated to goggles and the goggles reinforced with treats or play time. It is not recommended to try out goggles for the first time out on the mountain. Aim for about a week of acclimation around the house and neighborhood so your dog tolerates the equipment well. Dr. Daly has had good luck with RexSpecs which do not require a vet to measure the dog, but she is always happy to help owners measure their dogs.

Sunscreen: Surprisingly, canine sunburn is rare, even at high altitude. If it does occur, the burn is normally anywhere the dog has thin to no hair or pink to white skin. Most commonly it occurs on the nose and belly, especially if the dog prefers to lounge on its back in the sun. Mineral-based sunscreens with an active ingredient of titanium dioxide, such as California Baby Brand Sunscreen, are recommended. After putting sunscreen or any ointment on a dog’s nose it is a good idea to immediately give him or her a treat or chew toy to avoid the dog licking the ointment right off.

Prevention at High Altitude

The one best thing you can do to make sure your pet stays healthy and happy at altitude is to ensure adequate hydration. Dr. Daly does not recommend supplemental electrolytes but encourages owners not to depend on mountain streams, rivers, lakes, snow, or puddles to provide adequate hydration for active high country dogs. The high country has giardia and leptospirosis in natural water sources. Giardia can cause gastrointestinal symptoms, and leptospirosis can cause liver and kidney failure as well as having the potential to be transmitted to humans. Bring as much water for your dog as you do for yourself. If you bring one liter then also bring one liter for your dog. Signs your dog may be dehydrated include lethargy, decreased appetite, odd behavior, head-shaking, crying out, or barking. Dogs normally tend to drink more water while at altitude, and this behavior is only concerning if the dog has blood in the urine, appears to be in pain while urinating, or is having accidents in the house when the dog was previously housetrained.

Lastly, if you go camping with your dog it is imperative that you bring your dog’s daily medications with you and not skip a day simply because you are camping. Chronic medications can’t be skipped for even one dose.

Common High Altitude Diagnoses

Dr. Daly sees many recreational injuries and ACL tears between February and April. During this time of year, the snow has a crusty top layer with soft snow underneath. This leads to dogs punching through the top layer and injuring themselves when the soft snow underneath gives way. This post-holing causes many ligament strains and tears this time of year. In the beginning of winter when the conditions are predominantly slippery and icy, she sees wrist and toe strains and sprains from dogs trying to grip with their feet.

Another common injury are lacerations from back country skis. Many people enjoy taking their canine companion back country skiing but fail to train the dog to stay behind them while cruising down the slope. As a result, many dogs end up with lacerations from running in front of or beside their owner and making contact with their owner’s skis. This can lead to lacerations on the dog’s lower legs including around their tendons. It is also important to teach your dog to stay behind you if they come mountain biking. Many dogs end up with injuries from running in front of or beside their owner’s mountain bikes.

Head pressing

Acute mountain sickness (AMS), high altitude pulmonary edema (HAPE), re-entry HAPE, or high altitude cerebral edema (HACE) are exceedingly rare in dogs. The only situation which may predispose a dog to breathing problems is one coming from sea level with underlying cardiac or pulmonic pathology, such as heart failure or a pulmonary contusion. When coming from sea level with an older dog or one with an underlying comorbidity, it is recommended to stop in Denver for 2-3 nights to let the dog acclimate to the altitude and resultant lower oxygen concentration. Dogs can be prescribed home oxygen concentrators, but these should only be used under the supervision of a veterinarian as they require a specific home kennel or tubing being sewn into the dog’s nare. If your dog falls into a high risk category, Dr. Daly describes “head pressing” as an alarm sign requiring an emergency call to a local vet. This is described as a dog leaning headfirst into a wall, furniture, or other upright object as though it is using the object to hold its head up.  Other concerning signs include severe lethargy, vomiting or diarrhea that does not resolve within 24 hours, or respiratory distress of any kind.

Strengthening & Exercise

Most dogs will benefit from some degree of core and hind limb strengthening, as well as exercises to improve proprioception, or body awareness. The stronger and more coordinated the dog is, the lower risk of injury, even with high impact activities. Additionally, dogs can benefit from a personalized exercise program based on their confirmation, for example a long back or short legs, and pre-existing injuries. Dr. Daly’s background in sports medicine gives her a unique viewpoint allowing her to assess any dog and provide a program to prevent future and, more importantly, repeat injuries. If an owner is hoping that his or her companion can return to hiking 14ers after a ligament tear, then a home exercise program is imperative. Plans generally require about 20 minutes of treatment averaging three times a week and incorporating everyday activities such as stairs and working the dog on alternative surfaces. This ensures dog owners don’t necessarily have to invest in additional equipment.

Are there any winter dog sports clubs you recommend?

Dr. Daly has found that many types of active dogs enjoy the variety of mushing sports that can be done in the winter. These include everything from single or double dog skijoring, bikejoring, and canicross (which is a version of cross country running with your dog), all the way to dogsledding with two or more dogs. She is a part of the Colorado Mountain Mushers which is a great place to start for anyone interested in exploring these activities. The club consists of retired professional veterans to amateur mushers and is a friendly, welcoming, all-inclusive group with abundant resources and advice. The club usually runs about four events per year (COVID pending) and can help you learn some new ways to connect with your canine companion, Huskies not required!

Courtney Zak is currently in her second year of PA school at Red Rocks Community College in Arvada, CO. She is a member of the class of 2021 graduating in November. She attended the University of North Carolina at Chapel Hill in Chapel Hill, NC for her undergraduate degree in American Studies. She then completed an Occupational Therapy Assistant (OTA) program at Cape Fear Community College in Wilmington, NC. She practiced five years as an OTA working primarily with the geriatric population helping rehab people with various orthopedic injuries, strokes, heart attacks, and general deconditioning. After working up to management, Courtney decided she wanted to gain more medical insight and expand her scope of practice, so she decided to pursue a career as a physician assistant. Courtney now lives in Golden with her husband Jack, three dogs Brooks, Arlo, and Chloe, and her horse, Cannon. She enjoys horseback riding, hiking, paddle boarding, camping, and mountain biking in her free time.

Access at High Altitude

Perhaps you have experienced the snow packed, ice-covered sidewalks of Summit County, Colorado. You crunched your way along annoyed, but never thought much of it after. Imagine you approach the same treacherous sidewalk, only this time you are in a wheelchair. For those living with disabilities relying on mobility and other assistive devices, such a sidewalk is an impassable obstacle, and the unfortunate daily reality for much of the year in our winter-laden towns. No simple walks to morning coffee. No easy access to run errands or get to your doctor’s appointment. Nothing is a simple task.

Meet Leo Santos, a 26-year-old Summit County local who understands such challenges better than most. Since the age of three, Leo was brought up in our own Colorado mountains and knows the life of long winters in a rural town, but at the young and healthy age of sixteen his perspective would change. What started as joint swelling and pain progressed into the debilitating chronic condition known as gout. The disease became so severe it limited Leo’s physical mobility and forced him into a wheelchair. In 2018 Leo developed osteomyelitis, an infection deep in the bones of his left foot. The infection required immediate life-saving treatment, transfer by ambulance to Denver, and intensive care. Leo returned home to Summit as an amputee.

This was a dark time for Leo, now further limited in mobility and relying on in-home nursing care for recovery, an unusual fate for a young man. It was during this recovery Leo’s nurses, provided through Bristlecone Health Services, suggested he reach out to the NorthWest Colorado Center for Independence. After constant prodding from his caregivers, Leo reluctantly agreed to explore the program. The rest was life-changing.

The NorthWest Colorado Center for Independence (NWCCI) is a non-profit organization dedicated to helping individuals with any disability get their independence back. NWCCI serves youth, adults, and seniors alike, connecting them (consumers) with resources including independent living services, housing, transportation, assistive technology, and employment opportunities. Their only requirement? Be a willing participant and have at least one goal toward living independently. The organization has their headquarters in Steamboat Springs, CO, but serves individuals across North West Colorado, including chapters in Craig, Grand County, and Summit County. NWCCI is supported by grants and donations and offers services free of charge to their consumers.

Leo recalls the anger and frustration of his new reality post-amputation and his own reluctance to do anything. Leo remembers the day he decided to make a change, stating, “I can sit here and be miserable or get back out there and do what I love”. He instantly made his first goal: to physically leave his house. It was here he met Carlos Santos, a staff member of NWCCI and now dear friend, who helped Leo accomplish his first goal. Leo fondly recalls his first outing with NWCCI, a group trip to go painting in Breckenridge, and then to Downstairs at Eric’s for pizza and games. Goals were met, a community was found, and life-long friends were made that day.

Leo Santos and The Ebert Family Clinic Montañeros on their ascent up Arapahoe Basin ski area to over 12,000′

Despite Leo’s improved outlook with his newfound community, he was not spared of continued challenges. In Fall of 2019 Leo became a double amputee. In addition to another devastating change, he continues to live with intense chronic pain related to gout. He describes his journey away from addictive pain medication and commitment to being free. Leo confessed he does not consider himself to be strong or tough but has learned to deal with it in his own way. Leo hopes to receive his first prosthetic leg this March.

Many challenges face those living with disabilities in the High Country. Anyone needing a prosthesis or wheelchair must travel to Denver for fittings and supplies. Transportation which accommodates disabilities is an ongoing challenge, both with lack of properly adapted vehicles and volunteers to drive them. As the COVID-19 vaccine becomes available to this population and the seniors NWCCI serves, transportation to receive the vaccine is a major concern, as well as getting members on the waiting list. NWCCI hopes to reduce this obstacle. Other challenges outside of mobility include isolation among the disabled and elderly, long winters, and lack of general resources. Additionally, Leo brings to light the continued need for American Disabilities Act (ADA)-compliant housing, a regional challenge even for those without disabilities.

After almost three years as a consumer of NWCCI, Leo now proudly serves as the NWCCI Summit County Youth Coordinator. Leo hopes to inspire and connect with youth by sharing his own story and continued struggles. This year Leo will help plan and attend the Youth Leadership Forum, an annual conference which draws in youth from all over the state and provides education about ADA rights, being a self-advocate, and ultimately providing an opportunity for youth to transition independent from their parents. The conference will be held virtually this year. Leo gives a shout out to the other local programs supporting the disabled community in getting out on the mountain, such as the Keystone Adaptive Center (KAC), and Breckenridge Outdoor Education Center (BOEC).

“NWCCI staff and consumers are here to support anyone who is ready. We are willing to help and teach you if you are willing to help yourself,” he says. Leo stands firmly by this statement, saying they are not intrusive, but rather they are here with a supportive like-minded community with resources for independence when you are ready.

An accessible swing at a new playground in Frisco, Colorado’s Walter Byron Park.

Even the smallest of goals accomplished can change a life Leo explains,

“You don’t have to go anywhere; you can just go outside and sit in the sun. The better you feel the more you will want to do.”

Programs of NWCCI are spread much by word of mouth through consumers. More information can be found on their website at https://www.nwcci.org/. The organization is open to new consumers, volunteers, and donations. Opportunities for connection and support are available to all individuals including virtual gatherings. NWCCI is committed to supporting individuals living in their own homes and the communities they love, regardless of age or disability. 

To learn more about the United States’ largest minority group and the world of disabilities, view the inspiring true Netflix documentary Crip Camp: A Disability Revolution. Produced by Barack and Michelle Obama’s production company in 2020, Higher Ground Productions, Crip Camp tells the true story of a group of summer campers in the early 1970’s and their fight for recognition and civil rights. View the trailer here.

A woman in a white medical coat with a stethoscope around her neck and long blond hair stands arms folded in the foreground of a landscape covered in snow with tall, snow-capped mountains in the background under a bright, blue sky with some sunlit, fluffy, white clouds.

Ruth Nash is a second-year family nurse practitioner student at Colorado University, Anschutz Medical Campus. Born and raised in Cleveland, OH, Ruth attended Hocking College earning her Licensed Practical Nurse Diploma and licensure, followed by an Associates in Applied Science and Registered Nurse licensure, then completing a Bachelor of Science in Nursing from Ohio University. From the New England Appalachians, to the Midwest, and now here in the Colorado Rockies; Ruth has served in long-term care, bariatric surgery, pediatrics, special-needs adult programs, youth summer camps, and in the emergency room. Ruth lives full time in Keystone, CO and currently works in the emergency department at St. Anthony Summit Medical Center. Outside of the ER and pursuing an advanced practice license, Ruth enjoys mountain biking, hiking, skiing, rafting, art, and teaching barre fitness at a local dance studio. 

Doc Talk: ALTITUDE AND THE EYES, AN INTERVIEW WITH DR. PAUL COOK, OD

Have you ever wondered why a bag of chips will swell almost to the point of bursting when you travel from a lower elevation?  As the altitude increases  the barometric pressure decreases. The difference between the high pressure inside the bag and the low pressure outside causes the bag to swell (and sometimes burst) to reach equilibrium with the surrounding environment.

The same concept applies to our biological tissue, including our eyes. Luckily there is not normally gas in our eyes, but there are procedures where air bubbles are injected into the eye, such as a vitrectomy: part of the vitreous humor of the eye is replaced with air so that a nearby site has the chance to heal. Common indications include a retinal detachment, macular hole or removal of scar tissue. It’s important to remain at the elevation your ophthalmologist or optometrist indicates because you don’t want your eye to suffer the same fate as a bag of chips!

This was one of many interesting things I learned while speaking with D. Paul Cook, OD and his wife and practice manager Karen Cook at Summit Eye Center on Main Street in beautiful Frisco, CO. The following is my interview with Dr. Cook, Karen Cook, and my preceptor Christine Ebert-Santos, MD, MPS.

How many years have you been practicing optometry in Frisco, CO?

I don’t recall the exact year, but I remember it was the year the Broncos lost the Superbowl.

Dr. Paul Cook at the entrance of Summit Eye Center.

I did a little research and this must have been either the 1986 or 1987 season, as the Broncos lost both of those Superbowls. Fortunately, those Superbowl losses were not a bad omen as Dr. Cook has successfully served the Frisco area every year since.

What conditions do you see commonly here at altitude?

One thing I see commonly here is recurrent corneal abrasions. The classic patient lives at a lower altitude and previously had a corneal abrasion. They received treatment but the abrasion site never completely heals. After arrival in the high country where it’s extremely dry that abrasion site dries up and becomes inflamed.

Usually what I do is give a bandage contact lens to cover up that recurrent corneal abrasion, which usually works, but if it’s extremely painful, we can use amniotic membrane, which is expensive. But it is effective.

The cornea is the outermost layer of the eye (if you don’t count the tear film). A corneal abrasion occurs when any foreign object scrapes the corneal surface. Symptoms include a foreign body sensation, pain, clear discharge, blurry vision and sensitivity to light. A corneal abrasion needs a healthy, moist environment in order to heal. You can see how the dryness that comes along with altitude could lead to a recurrent corneal abrasion.

I also see a fair amount of snow blindness, usually in the spring though.

I suppose it has to do with the sun being higher in the sky and people being out and about hiking. When people are out skiing in the cold winter they wear their goggles, but if it’s spring time and somebody’s hiking they might forget their glasses.

Snow blindness is only one potential cause of a disease called photokeratitis. Other causes are staring at the sun, looking at an arc welder, or catching too many refracted UV rays from surfaces such as sun, water, ice and snow. The pathophysiology for each disease is the same: too many UV rays are focused onto the cornea at one time which causes damage. Symptoms include pain, redness, blurriness, sensitivity to bright light, headache, and occasionally temporary vision loss. Treatment for photokeratitis caused by snow blindness is supportive, but the most important thing is resting your eyes. Try to get into a dark room and avoid anything that makes your eyes uncomfortable. In a few days your cornea should heal.

Prevention  is straightforward: wear sunglasses or ski goggles with adequate sun protection.

Are cataracts a more common condition at altitude?

Oh yes, because of sun exposure and our aging population here. The people of Summit County are so active, which increases their exposure to the damaging rays of the sun. We’re also treating cataracts so much sooner than we used to, so that’s part of what makes it more common.

Do you have any recommendations for healthy aging at altitude as it relates to the eyes?

Karen: Getting your annual eye exam. We always tell patients there are a lot of things we can do to preserve your vision, there’s almost nothing we can do to give it back to you.

So if you live in Frisco, CO and don’t have an optometrist, make sure to see Dr. Paul Cook!

Is blurry vision a common malady in patients that have recently received a LASIK procedure and then ascended to higher elevations?

I have not seen that with LASIK. About 30 years ago though there was a procedure called Radial Keratotomy (RK) that involved a surgeon making radial cuts on the cornea in order to correct nearsightedness. Those patients used to require one pair of glasses for where they lived at lower elevation and one pair of glasses at higher elevation. It’s not a procedure commonly done nowadays but patients that had RK roughly 30 years ago may have that problem.

LASIK stands for Laser Assisted In Situ Keratomileusis. It essentially means that the surgeon will use a laser to reshape the cornea so that the light refracting through it will be appropriately concentrated on the retina. LASIK is faster, cheaper, safer and more effective than RK. It has largely usurped RK for surgical treatment of nearsightedness or farsightedness.

What are some interesting cases you have seen over your years of practice?

I treated a patient that traveled from the Midwest and had a genetic condition called retinitis pigmentosa. Clinically that means the patient had limited peripheral vision at baseline.  He and his wife decided to hike the Colorado Trail. Unfortunately during the hike he developed blurred vision and ended up coming into my office. Turns out he had macular edema and I referred him to an ophthalmologist down in Denver because the altitude was probably the cause of his macular swelling. I called him a few weeks later and his vision had returned to normal.

Another  patient came into the office because his wife had noticed growths on his iris that turned out to be nevi (colloquially known as moles when they’re on the skin). So I dilated his eyes and noticed growths on his retina. I referred him down to oncology in Denver for a biopsy and it turned out to be melanoma. I think they’re closely monitoring that melanoma at this point. It’s uncommon to see cancers of the eye but I see them once every few years.

Dr. Cook performing an eye exam on me.

For my last question, do you have any general recommendations for residents or visitors?

Wear sunglasses, eat your vegetables, eat your fish at least two times per week, keep your cholesterol in check, keep your sugars in check, take breaks from looking at the computer, don’t sleep in your contacts, and see your optometrist once per year.

Seth Selby is a second-year physician assistant student at Des Moines University. He was raised in Eaton, CO and attended Colorado State University with a bachelor’s degree in Health and Exercise Science. Prior to PA school, Seth worked for 3 years as a Cardiovascular Technician at Boulder Community Hospital. In his spare time Seth loves backpacking, hunting, fishing, skiing and astronomy.

The Plants We Need Are There: A Naturopathic Approach to Acute Mountain Sickness

Acetazolamide is already known for its success with treating Acute Mountain Sickness (AMS) and helping patients with their transition to higher altitudes, but what other options are available? What about those who don’t want a prescription, that are looking for other alternatives to help them with AMS and being at high altitude?

During my time in Frisco, Colorado (9000’/2743 m) I was fortunate enough to interview two resident Naturopathic Doctors. Mountain River Naturopathic Clinic on Main Street of this little mountain town is a wonderful oasis for anyone in Colorado’s Summit County looking for alternative care and treatment for their mind and body.

Dr. Kimberly Nearpass, ND and Dr. Justin Pollack, ND took the time to educate Dr. Chris Ebert-Santos, my classmate Rachel Mader, and myself about all the naturopathic remedies available for AMS and residents at altitude.

Tell us about Naturopathic medicine and why you picked this path of medicine?

Dr. Kimberly Nearpass: I thought I was going to be an OBGYN and then I did more research. I talked to doctors, midwives and herbalists and found that the Western medicine model didn’t feel right to me. So I thought, “Do I go to medical school and try to operate functionally from the inside or do I find another track?” I did not know about naturopathic medicine until a few years later. I took some time off; I traveled and went to the Peace Corps and then I discovered naturopathic medicine and loved it. I had lived in Ecuador in the rainforest as a naturalist guide so I learned a lot about traditional medicine that way. I learned a lot about traditional medicine when I lived in rural Africa as well. Living in these rural areas and watching the indigenous people — and they certainly use modern medicine — but they did not have a lot of access. Especially in the rainforest, they were using a lot of plants and I was fascinated by that. But I still wanted the medical training. Then I discovered naturopathic school. So, it’s four years of medical school, we get the medical training, but we also have that more holistic, natural, herbal based approach.

What naturopathic remedies are available for acute mountain sickness (AMS)?

Dr. Nearpass: So I will tell you Acli-Mate is our go-to. I’m not tied to this product, a friend of mine, it is her company, she is a naturopathic doctor in Gunnison. She formulated this, she started it out as a high-altitude electrolyte drink. Everybody that comes in our door, we start with this. This stuff works AMAZING. We rarely have to go anywhere else. I think the combination of the electrolytes and that it is hydrating has a great benefit. It helps with the headache and the nausea. For mild to moderate symptoms of AMS it is incredible. What we do is if we have family coming to visit from sea level is we have them start drinking it before they come.

Acli-Mate is found to be highly effective at helping people who are suffering from AMS. The blend includes herbs Ginkgo biloba and Rhodiola, both of which have proven effective in preventing and treating altitude related sickness. Both herbs seem to improve circulation, especially through cerebral vessels, and cellular energy function through improved uptake and utilization of oxygen, reducing toxic brain edema. Ginkgo has also been shown to inhibit platelet clumping, keeping red blood cells evenly dispersed, which improves delivery of oxygen to tissues, while Rhodiola appears to help the body deal with stress.

Nutrients in Acli-Mate: Vitamin C, and many of the B vitamins: thiamin (B1), riboflavin (B2), niacin (B3), pantothene (B5) and cobolamin (B12).

Acli-Mate in a variety of applications.

Have you noticed that when you have patients drink it before they arrive at high altitude, they have a better outcome?

Dr. Nearpass: Yes. And I have a patient who is 70 now and 5-10 years ago she went with some girlfriend to hike Mount Kilimanjaro. She had all her girlfriends take it and emailed me after saying, “We all did great!” And I don’t want to put all my eggs in one basket but this is almost always all we need.

Dr. Justin Pollack: There is something about that blend of Rhodiola, Ginkgo and the B vitamins that seems to work. We’ve had tons of people use it clinically.

Dr. Nearpass: For other options, I think Rhodiola is a good one. It’s interesting to me because Rhodiola grows in Mongolia, it grows in high altitude. One of the things we talk about in herbal medicine is often the plants we need are there. For example, dandelion root grows everywhere and it is good for liver detox and helps with hepatic function. So, it is interesting to me that dandelion is popping up on the side of the highways and in areas that we could probably use a little cleansing and detoxing.

Dr. Chris Ebert-Santos: What about Coca?

Dr. Nearpass: Oh yes! Coca works amazing. It is a plant that grows in the high altitudes of South America and when I was living in Ecuador the folks that live in the Andes drink coca tea all the time. They also take coca leaves and shove a wad in their mouth like chew. While they are doing work, cardiovascular work, they just put it in their mouth and that is their medicine. It gives them more stamina and reduces fatigue. There is not much research on it because you cannot even get it in the states.

Is there a reason you can’t get it here?

Dr. Nearpass: Because it’s the same plant as cocaine. We used to have a homeopathic version of it. Do you know what homeopathic medicine is? You take a remedy and you dilute it until you don’t have any molecules of the original substance but you basically are getting an energetic imprint. For example, Rhus tox, poison ivy, the homeopathic rhus tox is used to treat red itchy inflamed poison ivy type symptoms. But with coca, even homeopathically, the herb is used in concentrated doses to treat high altitude sickness and increase energy and stamina. But because there is such a control over coca, we can’t even get the homeopathic version, which is ridiculous because there is not a single molecule of the plant in the remedy.

Dr. Pollack: When Kim and I were on our honeymoon, we passed through Bolivia and Peru. In Bolivia in la Paz there was a coca museum. It was really fascinating because something around 1,000lbs of coca leaves must be distilled down into 1 gram to make cocaine. When you make tea out of the raw leaves it seems to have the subtle effect of suppressing appetite and allowing people to do better at altitude. Marijuana has a whole stigma around it, even though it has been legalized, and so the research and researchers are stigmatized, yet there are a lot of useful compound coming out of the plant. So, I’m sure that coca is the same, and hopefully somewhere down the line we will be able to use coca leaf for altitude.

Dr. Nearpass: And certainly, coca is the number one herb in the Andes that people use. You can get it everywhere, it’s like black tea down there.

So because coca is not available for your patients, and if you found Acli-Mate was not successful, what would you recommend?

Dr. Nearpass, a woman in a white hoodie, long brunette hair, and a maroon mask, stands in front of a wall of shelves of naturopathic medicine in brown glass jars with black lids at the Backcountry Apothecary in Frisco, CO.
Dr. Kimberly Nearpass

Dr. Nearpass: This is the thing about naturopathic doctors, we look at each individual. If it’s a resident, per se, we are going to draw blood work. We are going to try to figure out what’s going on, what is the underlying issue. Do you have relative anemia? We will run iron but also ferritin. They may have normal blood cells, normal H&H but their ferritin is a 2. One of the things that is tricky about being a naturopathic doctor is, we will be at a party and someone will ask, “Well what do you do for hypertension?” or “What do you do for digestive issues?” We always say we don’t treat symptoms; we don’t treat disease, we treat people. If someone is having recurrent altitude sickness, we are going to look at the individual and look at what is going on. What’s their diet? Are they hydrated enough? Are they drinking too much alcohol? Do they have subclinical hypothyroidism that might affect their metabolism and their ability to adapt when they get here? Might their ferritin levels be really low? And then we would sit down with the patient and say, “Well what are your symptoms? Is nausea the main symptom? Is headache the main symptom?”  And then, what other factors could be contributing to these symptoms? If it’s headache then CoQ10 would be what I would go to.

Dr. Chris Ebert-Santos: And what do you look for on physical exams on residents that are having trouble with altitude?

Dr. Nearpass: On physical exams we are doing the standard physical that you would do but we are also looking at the tongue. I am not a Chinese Medicine doctor but the tongue does give you some insight on what is going on in the digestive tract. If we are seeing inflammation or glossitis or geographic tongue, we are thinking, “Oh, this person may have some underlying digestive issue.” We might look at Arroyo’s sign, it’s a traditional sign when you shine a light on someone’s pupil and most of the time their pupil will constrict, but Arroyo’s sign is both pupils will stay dilated. This is a red light for adrenal issues, for hyper cortisol output or adrenaline output. If someone is in a chronically stressed state, their pupils are going to be dilated all the time. If it looks like someone has chronic stress, it takes you out of the parasympathetic, and so their digestion is going to be weaker. The way we look at it is the body has to prioritize, and there is only so much that one body can do. And I suspect that living at high altitude puts chronic stress on the body. I see this huge lack of libido in the women. I see women in their 20s, 30s, 40s, 50s. But it kind of makes sense right? If the body is chronically stressed, having a baby is a huge energy output for a woman. So, I think we may see the chronic stress impacts of living at high altitude.

Dr. Chris Ebert-Santos: So what do you do for the libido?

Dr. Nearpass: That is one that if I could invent one pill, it would be that one. Libido is really hard, especially in women. Unfortunately, what I see is its one of the first things to go in women and it’s one of the last things to respond. So, my suspicion is that this altitude is another physical stress on our bodies. I think we can see multiple systems being affected by it, maybe not severely but still.

Rachel Mader PA-S: Is there anything for sleep at altitude? I know a lot of people struggle with that.

Dr. Nearpass: Yes, again for us there is no magic bullet. Melatonin is very well known and that can be very helpful for some people, but it sure doesn’t work for everybody.  When patients come in and say, “What do you use for sleep?” I want to take every person back and have a conversation with them. Ask, “Are you having a hard time falling asleep? Are you having a hard time staying asleep? Are you waking up to go to the bathroom?” Right? So, there isn’t a magic bullet that will work for everyone. Breaking it down, I think you could have 50 people with altitude sickness and we’re going to do 50 different things. I mean, I would start with Acli-Mate, but every patient will be different.

Do you think there’s benefit to adding Acli-Mate in combination with an Acetazolamide prescription?

Dr. Nearpass: As far as I know, there’s no issue combining the two. Most people that come to us are usually trying to avoid medication, but what I always say to them in that situation is, “Try this other stuff to see if it helps.” But if it’s someone who had trouble in the past with AMS, I’ll say go to your medical doctor and get the prescription so that you have it if you need it. I think another issue is that people fly here right from Texas. They fly to Denver, they get right on the shuttle, and they drive right up here. If they’ve had trouble in the past, they should drive here and take their time. Spend a couple days in Denver if they have to. That does seem to help people.

Thank you so much Dr. Nearpass. Is there anything else about naturopathic medicine and high altitude you would like to share with us?

Dr. Nearpass: I guess I would say again that from a naturopathic perspective it is really about looking at the individual.

Is there anything that could specifically help with nausea symptoms of AMS?

Dr. Nearpass: Ipecacuanha! Ipecac syrup — which in full doses will make you throw up, so the homeopathic Ipecacuanha we use for nausea — that is one I have actually used quite a bit for people who have that aspect of AMS. It is really good for nausea and pregnancy too.

PA student Hannah Addison with Dr. Pollock, Dr. Nearpass and Dr. Chris in front of the Naturopathic clinic and apothecary in Frisco, CO.

The way I see Healthcare is a full spectrum, and on one end you have the brain surgeons and on the other end you have the Reiki energy healers. Then you have everything in between. I see us sitting in the middle. For patients, the best thing is to be aware of where they belong on that spectrum. I’m not going to replace a brain surgeon, but sometimes a little bit of massage and energy can do the trick. It is so great for us as practitioners to be able to talk and converse with the medical doctors. We’ve been really lucky in this community.

Visit Mountain River Naturopathic Clinic’s website or stop by their shop and clinic: http://www.mountainriverclinic.com

Available research articles on Naturopathic Remedies and AMS:

Zhang DX, Zhang YK, Nie HJ, Zhang RJ, Cui JH, Cheng Y, Wang YH, Xiao ZH, Liu JY, Wang H. [Protective effects of new compound codonopsis tablets against acute mountain sickness]. Zhongguo Ying Yong Sheng Li Xue Za Zhi. 2010 May;26(2):148-52. Chinese. PMID: 20684264.

Tsai TY, Wang SH, Lee YK, Su YC. Ginkgo biloba extract for prevention of acute mountain sickness: a systematic review and meta-analysis of randomized controlled trials. BMJ Open. 2018;8(8):e022005. Published 2018 Aug 17. doi:10.1136/bmjopen-2018-022005

Gertsch JH, Basnyat B, Johnson EW, Onopa J, Holck PS. Randomised, double blind, placebo-controlled comparison of ginkgo biloba and acetazolamide for prevention of acute mountain sickness among Himalayan trekkers: the prevention of high-altitude illness trial (PHAIT). BMJ. 2004;328(7443):797. doi:10.1136/bmj.38043.501690.7C

Ke T, Wang J, Swenson ER, et al. Effect of acetazolamide and gingko biloba on the human pulmonary vascular response to an acute altitude ascent. High Alt Med Biol. 2013;14(2):162-167. doi:10.1089/ham.2012.1099

Wang J, Xiong X, Xing Y, et al. Chinese herbal medicine for acute mountain sickness: a systematic review of randomized controlled trials. Evid Based Complement Alternat Med. 2013;2013:732562. doi:10.1155/2013/732562

Lee SY, Li MH, Shi LS, Chu H, Ho CW, Chang TC. Rhodiola crenulata Extract Alleviates Hypoxic Pulmonary Edema in Rats. Evid Based Complement Alternat Med. 2013;2013:718739. doi:10.1155/2013/718739

Hannah Addison, PA-S

Hannah Addison (she, her, hers) is a second-year physician assistant student at Red Rocks Community College Physician Assistant Program in Arvada Colorado. Hannah was born and raised in the South Denver area of Colorado. She spent four years getting her bachelor’s in biomedical science at Colorado State University in Fort Collins, CO where she decided her life career goal was to become a PA. After graduating and while applying for PA programs, Hannah worked at Littleton Adventist Hospital of Centura as a CNA, Telemetry Technician and Unit Clerk. In her free time, Hannah enjoys hiking and discovering all the delicious food and drink Colorado has to offer.

Paraguay Takes On Colorado’s Fourteeners

After a horrendous Autumn of forest fires in Colorado, we’ve received well over a foot of snow in a series of storms, and it’s safe to say Winter has arrived. Hiking season is never truly over in the Rockies, but Colorado’s famed Fourteeners are now blanketed in snow, increasing the risk of any attempted ascent exponentially. But through the fire and ice, the Summer yielded ample opportunity for at least one enthusiast to check off more of her bucket list adventures.

Since leaving her home in Paraguay, mountaineer and hiking expert Clarissa Acevedo Santos has spent over a decade ascending Colorado and Hawai’i’s highest peaks. In addition to her excursions in the Ko’olau and Kahalawai ranges including Maui’s Haleakalā crater, she has summited well over half the 58 peaks in Colorado over 14,000 feet, making her the first from her country of record to do so.

She was invited on her first Fourteener years ago when friends took her up Quandary outside of Breckenridge, CO, at 14,271′ (4350 m).

“When I hiked that first mountain, it was hard, because I wasn’t used to gaining that much elevation. I didn’t really enjoy it so much because of how cold it was on the summit. Even though I made it to the top, I wasn’t really having fun with not feeling my lips and not feeling my fingers because it was really, really cold. I could barely smile, and we couldn’t even enjoy the summit because of how windy it was!

“After that hike, I didn’t hike for a while, and I got invited again to climb Mt. Elbert in 2012. It was actually much more enjoyable because it was with a big group of college kids from Summit and the weather was just perfect. We were able to summit it and enjoy the day and have lunch up there. So that’s what started to change my mind about hiking Fourteeners because I enjoyed my time up top. That’s when I realized it’s not always difficult to be up there. I think I got what all the hikers call ‘Peak Fever’. So after that is when I feel like I started going non-stop, and I met more friends that were into hiking, and researched more about the mountain before I go.

“I always go with people who knew more about it, so I started learning more with other friends and other hikers. And I started feeling actually great when I got higher. It was always harder to get started close to the beginning [of the trail], just to gain all that elevation. But then when I was getting close to the summit, I just got more energy. I just got more excited to be at the top. That’s the goal. It’s a great feeling.”

Clarissa has an app that she uses to record all her summits called Colorado 14ers that allows her to keep record of and upload photos from every Fourteener she’s hiked. She pulls it up as she recounts year after year of more and more summits, some she’s even done more than once.

There is a class system rating every trail by level of difficulty, Class 1 being the easiest and Class 4 being the most difficult. The most difficult peak Clarissa recounts climbing is Long’s Peak, as well as the most dangerous weather she’s climbed in.

“It was a little bit late to summit it. It was not a good idea. If the rocks got wet, it could be very dangerous. There were people turning around. We decided to wait on a ridge. There were three [of us], and one turned around. He wasn’t feeling good, he was getting tired, he wasn’t used to hiking that many hours.

“We decided to wait for the clouds to go away. After that we just kept going. It did not rain on us, thankfully.”

Clarissa has seen her share of altitude sickness as well. One of her frequent hiking companions repeatedly gets stomachaches and headaches everytime they hike, in spite of being an experienced hiker as well.

“I always ask [one of my friends in particular] if she wants to stop or if she wants something. She normally doesn’t eat before she starts a hike. No breakfast. But I also carry ginger candy … I learned that from other hikers telling me it can help settle your stomach a little bit. It’s everywhere, in all the stores. Now they’ve created gums. I’ve started chewing them on my hikes just in case. You never know. I’ve seen people who hike all the time, and they ate something that didn’t digest well, and they feel sick and get a little dizzy.

“I’ve never experienced any headaches on the way up. The only time I remember having a headache is when I ran out of water. I hiked Oxford and Belford in the Saguache range in the same day. My head hurt and it lasted for that night. Now I take a filter with me so I can fill my [Camelbak] bladder. And I also take electrolytes. And I’ve started hiking with poles more as well, just because you put alot of weight on your knees when you’re hiking down. It’s very smart to start using poles.”

When it comes to preparing such demanding ascents, Clarissa recommends spending some time at an intermediate altitude before hitting the trail, and staying well-hydrated. Caffeine and alcohol the night before doesn’t typically help.

Clarissa with her husband on their way up Mt. Shavano in September 2019.

“It doesn’t matter how fit you are … you can still get really sick. I’ve heard of people who get headaches for several days because [they’re] not used to [the elevation here].”

She also says it’s important that you start any hiking at all to build the strength in your lungs.

“It does hurt,” she says about the stress on your respiratory system. “I remember when I was hiking Quandary, my chest was so pressed, my heart was [beating] so fast, my stomach was feeling weird, like I had to pee or I had to do number two or something. It was such a difficult part of … gaining all that elevation.”

“You’ve gotta find a good pace for yourself. I see many of my friends going really fast ahead of me, then they’re very tired and they have a hard time getting to the top. I’ve waited for many people because they are struggling so much at the end. Take as many breaks as you think [you need]. Carry enough water!

Clarissa keeps seeing a lot of hikers running out of water. “They just bring a tiny plastic bottle. That’s a huge mistake. And bring food, too. You will get hungry after a mountain. It’s so funny how many people are unprepared. If I’m hiking with newbies, I make sure they have everything, and they’re always thankful.”

When it comes to clothes and shoes, Clarissa recommends really good traction. She’s tried some more affordable brands, but says the durability is worth paying more for.

Don’t ever hike in new hiking shoes before you’ve broken them in. Good hiking socks also have more padding at the heels and toes and help prevent blisters. She also will double-up on socks, or even bring an extra pair to help mitigate possible cold.

“I reapply sunscreen on my hikes two to three times. Many times my nose will burn. I always carry sunglasses. You’re so close to the sun, you don’t realize. You don’t want to burn your eyes or your face. Even with the sunglasses, having a hat on top of it doesn’t hurt. Even in the Summer in the mountains, carry additional gloves or layers, because you don’t know what the weather could be. Temperature changes quick.

“I just recently purchased a nice puffy Northface that helped me. I will always have a thin layer underneath because you get hot and cold. You’re gaining elevation, you get hot, then you get cold in the middle …”

When it comes to navigation, Clarissa’s main resource is 14ers.com, which allows you to download offline maps, so you aren’t relying completely on having cell service.

“Even though I have hiked many of them, I want to be sure I’m going the right direction … I just love reading everything I can beforehand. I read about the class, how much exposure, how long it’s going to take, then I download the maps, look at the maps, what kind of road it’s going to be, if my car can make it up higher or if I have to hike longer.”

Clarissa has heard of other Paraguayans hiking around the world, but has never met another one on a Fourteener personally. But she does meet a lot of people from around the world on these ascents who ask if there are mountains in Paraguay. The highest is Cerro Peró at 2762′ (842 m) in this landlocked country known more for its rivers and the hydroelectricity they provide for Paraguay and its neighboring countries, including Brazil and Argentina.

Clarissa says she’s learning more and more each year about mountaineering and advocates learning as much as possible about each ascent before you go. The weather may be different every single time.

Bring the layers, whether you think you’ll need them or not. And leave no trace.

Thank you, Clarissa, for sharing your continuing legacy, and be safe up there!

robert-ebert-santos
Powder ‘stache.

Roberto Santos is from the remote island of Saipan, in the Commonwealth of the Northern Mariana Islands. He has since lived in Japan and the Hawaiian Islands, and has made Colorado his current home, where he is a web developer, musician, avid outdoorsman and prolific reader. When he is not developing applications and graphics, you can find him performing with the Denver Philharmonic Orchestra, snowboarding Vail or Keystone, soaking in hot springs, or reading non-fiction at a brewery. Clarissa is his wife who is increasingly a much faster, more experienced mountaineer than he is, but he will occasionally feel ambitious enough to join her on a Fourteener, at the top of which they both enjoy a delicious cider, weather permitting.

Acetazolamide

Typical symptoms of acute mountain sickness (AMS) are headache, loss of appetite, disturbed sleep, nausea, vomiting, fatigue, and dizziness. However, more serious conditions such as high altitude pulmonary edema (HAPE) or cerebral edema (HACE) can present with this illness. Avoiding these unpleasant symptoms while at elevatione is possible through gradual pre-acclimatization when possible (what science recommends!), or there are specific medications that can potentially prevent the development of AMS, such as acetazolamide. This article will address how acetazolamide (also known as Diamox) can help prevent AMS, discuss the physiological effects of the medication, some side effects, and whether or not this drug can enhance physical performance.

 How does it work?

Acetazolamide is a carbonic anhydrase inhibitor. Carbonic anhydrase regulates kidney absorption of sodium bicarb and chloride. Acetazolamide works by inhibiting carbonic anhydrase, preventing the reabsorption of sodium bicarb and chloride, causing acidosis in the blood. When experiencing AMS, the body is in a state of respiratory alkalosis. By taking acetazolamide, which causes metabolic acidosis it drives receptors in the body to increase the patient’s minute ventilation by as much as 50%, improving arterial PO2 and increasing oxygen saturation.

How can I obtain acetazolamide and when should I start taking it?

Acetazolamide requires a doctor’s prescription, and the typical dose for the prevention of AMS is 125 mg twice daily. The typical recommendation is to start taking acetazolamide one day before your exposure to high altitude and continue usage throughout your trip. When taken one day before exposure, studies show that acetazolamide reduced AMS incidence and enhanced tolerance to submaximal exercise on the first day at high altitude versus starting administration the day of arrival.2 However, if, for some reason, the medication isn’t started a day before arrival to high altitude, then the medication should be started upon arrival, which still shows a decreased incidence in the development of AMS. 

Allergies & Side Effects

Acetazolamide belongs to a classification of drugs known as sulfonamides, which is broken down further into two categories: antibiotics and nonantibiotics. Acetazolamide is considered a nonantibiotic sulfonamide, which varies significantly from sulfonamide antibiotics because these antibiotics contain what is known as an arylamine group in their chemical structure. This arylamine group is a key component of the allergic response to sulfonamide antibiotics (sulfamethoxazole, sulfasalazine, sulfadiazine, and the anti-retrovirals amprenavir and fosamprenavir); however, this structure is not present in other sulfonamide drugs like acetazolamide.1 There is available evidence that suggests patients who are allergic to arylamine sulfonamides do not cross-react to sulfonamides that lack the arylamine group and so may safely take non-arylamine sulfonamides.1 Patients with known allergies to sulfonamide drugs should consult with their healthcare provider before taking acetazolamide.

Like all other medications, there are risks that side effects will occur with acetazolamide’s administration. The common side effects are fatigue, malaise, changes in taste, paresthesia, diarrhea, electrolyte disorders, polyuria, and tinnitus. While conducting research, I found 3 – 4 people from my hometown, located at 69 feet above sea level, who have taken acetazolamide while rapidly ascending to 8,000+ feet to ski or hunt. When asked how their experience was taking acetazolamide, the common response was that they stopped using it within the first two days due to the change in the taste of their beer! The pleasurable “fizz” in our carbonated drinks is attributed to chemical excitation of nociceptors in the oral cavity via the conversion of CO2 to the carbonic acid in a reaction catalyzed by carbonic anhydrase. So administering a carbonic anhydrase inhibitor like acetazolamide results in flat-tasting carbonated drinks, or, as described by the aforementioned subjects, a “nasty beer”!4 While a bad tasting beer is no fun, AMS is a lot less fun, and one would be best advised to continue taking acetazolamide while at high altitude.

Can taking acetazolamide increase physical performance and endurance at high altitudes?

Though enticing, it doesn’t seem to work out that way. There are multiple studies on exercise endurance in hypoxic conditions with the administration of acetazolamide, but the produced results are confounding. The majority of the studies show that for a non-acclimated person taking acetazolamide in hypoxic conditions, endurance and exhaustion time were increased with submaximal and maximal exercise. A few reasons this may be true are the induction of metabolic acidosis and its effects on muscle cells, the diuretic effect of the drug inducing dehydration, and additional increases in work of breathing cause vasoconstriction in locomotor muscles, which can impair exercise performance.3 Regardless, this medication’s proven science in the prevention of AMS should not be mistaken with the multiple confounding studies on exercise endurance.

Scott “Scotty B” Rogers, FNP-S

From Opelousas, Louisiana, Scott Rogers is currently a Family Nurse Practitioner student at Walden University after having practiced five years as an RN following his BSN from the University of Louisiana at Lafayette. He has lived in Colorado for the past four years where he enjoys hiking with his wife and dog, snowboarding all the resorts in Summit County, and basketball, and hopes to pursue more work with acute physical rehabilitation, orthopedics, and sports medicine.

References

1. American Academy of Allergy Asthma & Immunology. (2019, June 23). Acetazolamide and sulfonamide allergy: AAAAI. Retrieved November 13, 2020, from https://www.aaaai.org/ask-the-expert/acetazolamide

2. Burtscher, M., Gatterer, H., Faulhaber, M., & Burtscher, J. (2014). Acetazolamide pre-treatment before ascending to high altitudes: when to start?. International journal of clinical and experimental medicine, 7(11), 4378–4383.

3. Garske, L., Medicine, 1., Brown, M., Morrison, S., Y, B., G., B., . . . Zoll, J. (2003, March 01). Acetazolamide reduces exercise capacity and increases leg fatigue under hypoxic conditions. Retrieved November 13, 2020, from https://journals.physiology.org/doi/full/10.1152/japplphysiol.00746.2001

4. Jean-Marc Dessirier, Christopher T. Simons, Mirela Iodi Carstens, Michael O’Mahony, E. Carstens, Psychophysical and Neurobiological Evidence that the Oral Sensation Elicited by Carbonated Water is of Chemogenic Origin, Chemical Senses, Volume 25, Issue 3, June 2000, Pages 277–284, https://doi.org/10.1093/chemse/25.3.277