Heat-Related Illnesses.

There is a growing incidence of heat-related illnesses due to rising global temperatures. Heat-related illnesses range from mild to severe, with heat stroke being the most critical. The wet bulb global temperature index considers humidity and solar intensity; its use is recommended to estimate heat stress on an individual and mitigate risk. Efficient cooling methods, such as cold water immersion, are essential in severe cases. Prevention is through hydration, appropriate clothing, recognition of high risk medications, and awareness of environmental conditions. Recognizing heat-related illnesses early in the clinical course and implementing rapid cooling strategies reduces morbidity and mortality.

Implementation of a Specialty Society‒Sponsored Wilderness Medicine Fellowship Match.

INTRODUCTION: Previously, wilderness medicine (WM) fellowships offered spots to applicants using an offer date. Due in part to increases in the number of WM fellowships and applicants, in 2021, the WM program directors (PDs) agreed to conduct the first WM fellowship match through the Wilderness Medical Society graduate medical education committee. This article outlines the process used and demonstrates its feasibility. METHODS: To create an independent matching process, a simulation was performed using imaginary programs and participants. Using the same algorithm utilized by the National Resident Matching Program, this process was completed manually and by computer to ensure accuracy. The PDs shared an email with the applicants they interviewed and submitted their names. Applicants registered for the match and generated a match list. The PDs then submitted a rank list of applicants they interviewed through a similar Google form. These lists were used to run the matching algorithm both manually and by computer. Any programs that did not "fill" or applicants who did not "match" were contacted to participate in a secondary match. Following the match, a survey was sent to PDs and participants for process improvement. RESULTS: The match filled 11 of 14 participating programs and 15 of 19 applicants. The results obtained via a computer algorithm were consistent with multiple human validations. The survey results were mostly positive, with 2 neutral responses and no negative responses. CONCLUSIONS: The inaugural WM fellowship match was successful in matching the majority of programs and participants and was well-received by both directors and applicants.

Professional Outcomes and Satisfaction Among Graduate Medical Education Wilderness Medicine Fellowship Alumni in the United States.

INTRODUCTION: Wilderness medicine (WM) graduate medical education (GME) fellowships were established in 2003. Outcomes and satisfaction of US WM GME fellowship alumni can inform prospective applicants and program directors of the strengths of fellowships and professional gaps in them. METHODS: A 34-question Qualtrics survey was emailed to 111 alumni from 17 institutions listed in the Wilderness Medical Society's GME database in May 2019. Professional service, scholarship, and satisfaction were queried. Results are represented as percent response (n=answered affirmative) based on the number of respondents per question. RESULTS: The survey response rate was 41% (n=46); 67% reported (n=31) Fellowship of the Academy of Wilderness Medicine recognition. Within the last 5 y, 71% (n=32) reported publications in WM. Free text entry questions had 78% (n=28) describe improved clinical skills, and 68% (n=26) were exposed to new career choices in fellowship. Those who rated exposure to a variety of WM knowledge and skills highly rated the overall fellowship experience higher (P<0.001), as did those reporting a higher number of WM publications (P=0.023). Nearly half, 48% (n=21), felt they could hold their current position without fellowship training. In hindsight, 76% (n=34) would follow the same professional path. CONCLUSIONS: WM GME fellowship alumni reported high rates of professional engagement and scholarly productivity in the subspecialty. Responding alumni overwhelmingly rated the fellowship experience positively. Fellowships that ensure a wide exposure to experiences and foster scholarly productivity are more likely to yield professionally satisfied graduates.

Search and Rescue in the Pacific West States.

INTRODUCTION: The training practices and the level of medical oversight of search and rescue (SAR) organizations in the US National Park Service (NPS) Pacific west region is not known. METHODS: A database of SAR teams in the NPS Pacific west region was assembled using public sources. SAR team leaders received an electronic survey between May and December 2019. A descriptive analysis characterizing team size, technical and medical training protocols, and medical oversight was completed. Results are reported as median (interquartile range, range). RESULTS: Of the 250 SAR teams contacted, 39% (n=97) completed our survey. Annual mission volume was 25 (10-50, 1-200). Team size was 30 members (22-58, 1-405). SAR teams most frequently trained in helicopter operations (77%), low-angle rope rescue (75%), and avalanche rescue (43%). Nearly all teams (99%) had members with some medical training: first aid or cardiopulmonary resuscitation (89%), emergency medical technicians (75%), registered nurses or midlevel providers (52%), and physicians (40%). SAR members administered field medical care (84%), often in coordination with EMS (77%). Medical direction was present on a minority of teams (45%), most frequently by a provider specialized in emergency medicine (68%). Expanded medical procedures were permitted on 21% of SAR teams. CONCLUSIONS: SAR teams across the NPS Pacific west region had composition and training standards similar to those surveyed previously in the US intermountain states. Healthcare professionals were present on most teams, typically as team members, not as medical directors. Few SAR teams use medical protocols in remote care environments.

Epidemiology of Ice Climbing Injuries Among Recreational Ice Climbers at the 2019 Ouray Ice Climbing Festival.

INTRODUCTION: As a close relative to the sports of mountaineering and rock climbing, water ice climbing has been traditionally considered "high risk." There is little data to support or refute this assertion. Prior estimates of the injury rate range from 4.8 to 248 injuries per 1000 participation hours. In this study, we characterized the types of injuries and determined an injury incidence among water ice climbing participants at the 2019 Ouray Ice Festival climbing manmade ice walls. METHODS: A survey was distributed during the 2019 Ouray Ice Festival in Ouray, Colorado. Respondents were asked to include festival-related injuries and estimate their participation time at the 4-d festival. Individuals who reported an injury were asked to provide additional details with regard to injury type, location, and timing. The injury incidence rate was calculated as the total number of injuries reported divided by the total number of participation hours and is reported as injuries per 1000 participation hours. RESULTS: A total of 75 surveys were analyzed. A total of 16 injuries, all which were minor, and 912 participation hours were reported, resulting in an injury incidence of 17.6 injuries per 1000 participation hours. CONCLUSIONS: This study reports an injury incidence based on an unselected sample of water ice climbers at an ice climbing festival. Water ice climbing at festivals appears to result in injuries of minor severity with no major accidents or fatalities. This study could be repeated to confirm its validity with a larger sample size.

Is it Time for Wilderness Medicine Fellowships to Join the National Resident Matching Program Specialties Matching Service?

INTRODUCTION: The national resident matching program specialties matching service (SMS) fills fellowship positions for 66 subspecialties. Wilderness medicine (WM) fellowships currently do not participate in SMS; instead, WM uses an offer date to fill positions. To be successful, at least 75% of the available positions within a subspecialty must be within the SMS match. METHODS: All 13 civilian WM fellowship directors recruiting for academic year (AY) 2019 to 2020 and WM fellowship alumni were surveyed regarding future participation in the SMS. Estimation of the performance of SMS for WM was calculated using data published by the national resident matching program. RESULTS: Fellowship directors from all 13 civilian WM fellowships and 60 fellowship alumni participated in the survey. SMS was supported by 62% (n=8) of fellowship directors and 55% (n=33) of fellows. Willingness to pay SMS fees was 54% (n=7) among fellowship directors and 60% (n=36) among fellows. Of matched applicants, 85% (n=51) obtained their top choice program. SMS, if implemented, was perceived to have no impact on matching a top choice program by 53% (n=31); however, 34% (n=20) believed SMS would improve the chance of an applicant matching higher. The match success of SMS for specialties with fewer than 30 programs is 74%. Of the 20 WM fellowship positions in AY 2019 to 2020, 16 were matched, for a success rate of 80%. CONCLUSIONS: There is insufficient support (<75%) at this time to institute an SMS match for WM. The offer date performed similarly to SMS for filling fellowship positions in AY 2019 to 2020.

Prehospital Traction Splint Use in Midthigh Trauma Patients.

CONTEXT: Traction splint (TS) use during emergency medical system transport has been theorized to relieve pain, limit continued injury from loose bone fragments, and decrease potential bleeding space in the injured thigh. AIMS: This study aimed to evaluate the benefit of prehospital TS (PTS) application, using data from the trauma registry at a large Level 1 trauma center. METHODS: A retrospective review of patients from the NTRACS© and Trauma One© registry at an American College of Surgeons-verified Level 1 trauma center was conducted. All patients treated between the years 2001 and 2011 who were assigned a diagnosis International Classification of Diseases-9 code of 821.01 (closed fracture of shaft and femur) and 821.11 (open fracture of shaft and femur) (femur fracture [FF]) were included. STATISTICAL ANALYSIS: All categorical variables between the first groups were compared using Pearson's Chi-square and Fisher's exact test analysis. Comparisons were made using unpaired t-tests and Mann-Whitney test or Kruskal-Wallis one-way ANOVA, followed by Dunn's post hoc pairwise comparisons. RESULTS: Patients with a TS and those without indicated that the patients with no traction split (NTS) had sustained injuries beyond a FF (14.43 ± 9.740 vs. 18.59 ± 12.993, P < 0.001). The three groups of TS placement (PTS, hospital, and NTS) only used patients with Injury Severity Score < 9 (n = 218). Hospital length of stay (LOS) was found to be significant (P = 0.05) between the patients who received a hospital TS (3.10 ± 1.709) and NTS (5.42 ± 5.144). CONCLUSION: PTS can lower LOS and mortality. Further research is needed to confirm these findings.

Impact of a Half Dome Cable Permitting Process on Search and Rescue Activity, Hiker Mortality Rates, and Operational Costs Above Little Yosemite Valley.

INTRODUCTION: The summit of Yosemite's Half Dome is reached using cable handrails for the final 146 m (480 ft). Access to these cables was restricted to users with permits in 2010. The authors aim to describe the impact of permitting on search and rescue (SAR) in the region of the park most affected by permitting. METHODS: An observational study from 2005 to 2009 and 2011 to 2015 comparing the number of incidents, major incidents (exceeding $500), victims, and fatalities before and after permitting the use of cable handrails on Half Dome in the area above Little Yosemite Valley (LYV) and parkwide. Each year was analyzed separately with t tests and Mann-Whitney U tests. Data are presented as mean±SD. RESULT: The number of hikers in the study area was reduced by up to 66% by permitting. Above LYV from 2005 to 2009, there were 85 SAR incidents, 134 victims, 8 fatalities, 38 major incidents, and annual SAR costs of $44,582±28,972. From 2011 to 2015, the same area saw 54 SAR incidents, 156 victims, 4 fatalities, 35 major incidents, and annual SAR costs of $27,027±19,586. No parameter showed statistical significance. Parkwide SAR incidents decreased from 232 to 198 annual incidents (P=0.013) during the same time period, with parkwide mortality increasing from 8 to 12 deaths annually (P=0.045). CONCLUSIONS: SAR incidents, victims, fatalities, or costs above LYV did not decrease after cable handrail permitting. Parkwide SAR activity decreased during the same intervals. This strongly suggests that overcrowding is not the key factor influencing safety on Half Dome. This discordant trend warrants close observation over 5 to 10 y.

Emergency Medical Services and Remote Medical Oversight in Sequoia and Kings Canyon National Parks, 2011-2013.

INTRODUCTION: The University of California San Francisco Fresno Department of Emergency Medicine provides base hospital support for the Sequoia and Kings Canyon National Parks (SEKI) emergency medical services (EMS) system. This descriptive epidemiologic study reports reasons the park EMS system is used and interventions provided, detailing the nature of patient encounters, type and frequency of injuries and interventions, reasons for base hospital contact, and patient dispositions. METHODS: Patient charts for all EMS encounters in SEKI from 2011 to 2013 were included, and relevant data were extracted by a single reviewer. RESULTS: Of the 704 charts reviewed, 570 (81%) were frontcountry patient encounters (within 1.6 km [1 mi] of a paved road); 100 (14%) were backcountry; and 34 (5%) occurred in undefined locations. Regarding sex and age, 58% of patients were men; 22% were younger than 18 y, and 15% were 65 y or older. More than 80% of calls occurred during the months of June through August. The most common complaints were extremity trauma (24%), torso trauma (13%), and lacerations (9%). Almost 50% of patients were transferred to a higher level of care. Medications were administered to 37% of patients, with oxygen being the most common. Procedures were performed 49% of the time, primarily intravenous access and splinting. Base hospital contact was made 38% of the time, most commonly (54%) for advice regarding disposition. CONCLUSIONS: SEKI EMS providers encounter a wide variety of patients in various settings, including the backcountry. Resource allocation, training, and protocol development should be tailored to meet their needs.

Death on the Dome: Epidemiology of Recreational Deaths on Half Dome in Yosemite National Park.

INTRODUCTION: One of the most popular destinations in Yosemite National Park is Half Dome. Overcrowding at the turn of the 21st century prompted a restriction of hiker access to cable handrails to the summit without technical rock climbing equipment. Prior epidemiological study of Half Dome deaths is not known to the authors. Our goal was to identify trends among all Half Dome-related fatalities in Yosemite National Park. METHODS: Multimedia sources were searched for deaths involving the cable handrails, subdome, summit, technical climbing, or base jumping. Results are reported as mean±SD (range). RESULTS: Twenty-nine confirmed deaths occurred on Half Dome, with 2 additional deaths likely on Half Dome. Age was 32±14 (16-86) y; 4 were female. Activity at time of death included technical climbing (36%), suicide (26%), utilizing cable handrails (16%), hiking (16%), and base jumping (6%). Of the cable handrail-related fatalities, only 2 were due to weather. There were 3 medically related deaths due to cardiac disease and altitude. CONCLUSIONS: We identified 31 Half Dome deaths over 85 y. A minority were attributable to unfavorable weather or unskilled hiking participants. Climber registration could provide dependable denominators for accident incidence statistics. A renewed focus on suicide prevention is warranted.

The Epidemiology and Medical Morbidity of Long-Distance Backpackers on the John Muir Trail in the Sierra Nevada.

INTRODUCTION: The baseline characteristics and medical morbidity of hikers on the 354 km (220 mi) John Muir Trail (JMT) have not been previously reported. METHODS: Using online and on-site recruitment, hikers completing the JMT in 2014 were directed to an online 83-question survey. Pearson correlations, regression models, and descriptive statistics were applied to data, reported as mean±SD (range). Statistical significance was set at P<0.05. RESULTS: Of 771 respondents, 57% were men aged 43±14 (13-76) y; they hiked 15.2±7.6 (5-34) days and traveled 272±129 (45-1207) km (169±80 [28-750] mi). Backpackers lost 3.5±2.6 (+3.6 to -18.2) kg (7.7±5.8 [+8 to -40] lbs). Over half (57%) of respondents reported illness or injury, with blisters (57%), sleep problems (57%), and pack strap pain (46%) most prevalent. Altitude illness affected 37%. Thirty hikers left the trail; of these, 4 required emergency medical services evacuations (3 by helicopter). Increasing age, base pack weight, and body mass index (BMI) were all associated with a decrease in the distance hiked per day. Higher base pack weight was associated with illness or injury, whereas older age was slightly protective. Increasing BMI was associated with a slight increase in medical illness or injury and a strong association with evacuation from the trail. CONCLUSIONS: JMT hikers experienced medical issues seen on other national trails. Weight loss was prevalent. Most hikers had medical complaints, with few seeking medical attention. Heavy packs and higher BMIs were associated with undesirable outcomes, while older hikers fared better.

An Assessment of Diarrhea Among Long-Distance Backpackers in the Sierra Nevada.

INTRODUCTION: Diarrhea is a common problem among long-distance backpackers, ranging in overall incidence from 11-56% as reported by previous studies on the Appalachian Trail and Long Trail. Differences in age, sex, and regularity of standard backcountry hygiene recommendations and practices have been shown to significantly affect the incidence of diarrhea. No study to date has investigated these trends among long-distance backpackers on the John Muir Trail (JMT) in the Sierra Nevada mountain range of California. METHODS: Retrospective analysis of online survey data gathered from long-distance backpackers who attempted a JMT trek in 2014. Data were assessed for the significance of variables that might contribute to the incidence and severity of on-trail diarrhea. RESULTS: Of 737 valid responders, 16.4% reported experiencing diarrhea (82% with minimal/mild severity; 18% with significant severity). Regular hand sanitizer use was significantly correlated with more severe diarrhea (P < .05), but had no effect on incidence. Regular hand sanitizer users followed all other recommended hygiene practices as frequently as or better than those not using hand sanitizer regularly. Of all backpackers, 88% filtered or treated their drinking water regularly, with 18% of those reporting diarrhea of any severity. CONCLUSIONS: JMT backpackers have a comparatively lower incidence of diarrhea than backpackers on other major long-distance backpacking routes in the United States. Most JMT backpackers follow standard backcountry hygiene recommendations, including regular filtration or treatment of drinking water. No statistical significance was found between the incidence of diarrhea and compliance with standard hygiene recommendations. Regular hand sanitizer use was significantly correlated with more severe diarrhea but was not associated with incidence. There was no significant difference in compliance with standard backcountry hygiene practices between regular and infrequent hand sanitizer users.

Pressures of Wilderness Improvised Wound Irrigation Techniques: How Do They Compare?

OBJECTIVE: Compare the pressures measured by improvised irrigation techniques to a commercial device and to prior reports. METHODS: Devices tested included a commercial 500-mL compressible plastic bottle with splash guard, a 10-mL syringe, a 10-mL syringe with a 14-ga angiocatheter (with needle removed), a 50-mL Sawyer syringe, a plastic bag punctured with a 14-ga needle, a plastic bottle with cap punctured by a 14-ga needle, a plastic bottle with sports top, and a bladder-style hydration system. Each device was leveled on a support, manually compressed, and aimed toward a piece of glass. A high-speed camera placed behind the glass recorded the height of the stream upon impact at its highest and lowest point. Measurements were recorded 5 times for each device. Pressures in pounds per square inch (psi) were calculated. RESULTS: The syringe and angiocatheter pressures measured the highest pressures (16-49 psi). The 50-mL syringe (7-11 psi), 14-ga punctured water bottle (7-25 psi), and water bottle with sports top (3-7 psi) all measured at or above the commercial device (4-5 psi). Only the bladder-style hydration system (1-2 psi) and plastic bag with 14-ga needle puncture (2-3 psi) did not reach pressures generated by the commercial device. CONCLUSIONS: Pressures are consistent with those previously reported. All systems using compressible water bottles and all syringe-based systems provided pressures at or exceeding a commercial wound irrigation device. A 14-ga punctured plastic bag and bladder-style hydration pack failed to generate similar irrigation pressures.

A lightning multiple casualty incident in Sequoia and Kings Canyon National Parks.

Multiple casualty incidents (MCIs) are uncommon in remote wilderness settings. This is a case report of a lightning strike on a Boy Scout troop hiking through Sequoia and Kings Canyon National Parks (SEKI), in which the lightning storm hindered rescue efforts. The purpose of this study was to review the response to a lightning-caused MCI in a wilderness setting, address lightning injury as it relates to field management, and discuss evacuation options in inclement weather incidents occurring in remote locations. An analysis of SEKI search and rescue data and a review of current literature were performed. A lightning strike at 10,600 feet elevation in the Sierra Nevada Mountains affected a party of 5 adults and 7 Boy Scouts (age range 12 to 17 years old). Resources mobilized for the rescue included 5 helicopters, 2 ambulances, 2 hospitals, and 15 field and 14 logistical support personnel. The incident was managed from strike to scene clearance in 4 hours and 20 minutes. There were 2 fatalities, 1 on scene and 1 in the hospital. Storm conditions complicated on-scene communication and evacuation efforts. Exposure to ongoing lightning and a remote wilderness location affected both victims and rescuers in a lightning MCI. Helicopters, the main vehicles of wilderness rescue in SEKI, can be limited by weather, daylight, and terrain. Redundancies in communication systems are vital for episodes of radio failure. Reverse triage should be implemented in lightning injury MCIs. Education of both wilderness travelers and rescuers regarding these issues should be pursued.

Long-term complications of rattlesnake bites: a telephone survey from Central California.

OBJECTIVE: The purpose of this institutional review board-approved, cross-sectional study was to identify residual symptoms and signs of envenomation reported by snakebite survivors via a telephone survey. METHODS: Victims of rattlesnake bite who were treated at a single hospital center during a 10-year period were contacted through a telephone survey. Study subjects were included through a diagnosis-based retrospective chart review of snakebite victims, and excluded if they did not receive rattlesnake antivenom. Data collection was done using a standardized form that included sections about residual, recurrent, or new pain, weakness, paresthesias, or other limitations of the bitten limb. RESULTS: We identified 46 snakebite cases including 5 of 46 "dry" bites. The remaining cases (41 of 46) all received Crofab. Interviews were completed for 31% of these patients (13 of 41), and the remainder were lost to follow-up. Most bites occurred in men (12 cases, 92% males) and on the arms (9 cases, 69%). Six of the 13 respondents (46%) reported residual symptoms from the bite. Persistent symptoms described included localized pain at the bite site (3 cases), numbness or paresthesias (2 cases), abnormal skin peeling and discoloration at the bite site (2 cases), and persistent weakness of the bitten extremity (1 case). Among patients reporting persistent symptoms, the bite-to-survey interval ranged from 7 months to 12 years, with a median interval of 4 years. CONCLUSIONS: Our study population demonstrated a notable incidence (43%) of self-reported persistent symptoms related to their rattlesnake bites, although the overall level of disability from these injuries seems low.