Wilderness injuries and illnesses

Preliminary Evidence-Based Method of Medical Kit Design for Wilderness Expeditions Modeled by a High-Altitude Expedition to Mount Kilimanjaro

BACKGROUND

Wilderness expeditions require extensive planning and the correct medical supplies to ensure clinical care is possible in the event of illness or injury. There are gaps in the literature regarding evidence-based methods for medical kit design.

OBJECTIVES

This report describes a preliminary method for predicting medical events to determine medical supply requirements for a wilderness expedition. The performance of this method was evaluated using data from the 2017 Equal Playing Field (EPF) expedition to Mount Kilimanjaro.

METHODS

Eight reports documenting medical events during wilderness expeditions were reviewed. Incidence data were consolidated into a new dataset, and a subset of data from adventure race expeditions (ARS) was created. The cumulative incidence of medical events was then predicted for the 9-day EPF expedition. The medical supply list was determined based on indication. The effectiveness of the full dataset and ARS to predict the cumulative incidence of medical events by category during the EPF expedition was evaluated using regression analysis.

RESULTS

The ARS predicted a higher incidence rate of medical events than the full dataset did but underestimated the EPF expedition incidence rate. The full dataset was a weak predictor of the cumulative incidence of medical events by category during the EPF expedition, while the ARS was a strong predictor. The finalized medical kit overestimated all nonreusable supplies.

CONCLUSIONS

The medical kit created using this method managed all medical events in the field. This report demonstrates the potential utility of using a tailored, evidence-based approach to design a medical kit for wilderness expeditions.

Wilderness Medical Society Clinical Practice Guidelines for the Prevention and Management of Tick-Borne Illness in the United States

The Wilderness Medical Society convened an expert panel to develop evidence-based guidelines for the prevention and management of tick-borne illness (TBI). Recommendations are graded based on quality of supporting evidence according to criteria put forth by the American College of Chest Physicians. The guidelines include a brief review of the clinical presentation, epidemiology, prevention, and management of TBI in the United States, with a primary focus on interventions that are appropriate for resource-limited settings. Strong recommendations are provided for the use of DEET, picaridin, and permethrin; tick checks; washing and drying clothing at high temperatures; mechanical tick removal within 36 h of attachment; single-dose doxycycline for high-risk Lyme disease exposures versus "watchful waiting;" evacuation from backcountry settings for symptomatic tick exposures; and TBI education programs. Weak recommendations are provided for the use of light-colored clothing; insect repellents other than DEET, picaridin, and permethrin; and showering after exposure to tick habitat. Weak recommendations are also provided against passive methods of tick removal, including the use of systemic and local treatments. There was insufficient evidence to support the use of long-sleeved clothing and the avoidance of tick habitat such as long grasses and leaf litter. Although there was sound evidence supporting Lyme disease vaccination, a grade was not offered as the vaccine is not currently available for use in the United States.

Medical Incidents and Evacuations on Wilderness Expeditions for the Northwest Outward Bound School

INTRODUCTION

Outdoor education (OE) expeditions travel far from definitive care and have unique epidemiology. Most OE expedition studies have examined a single organization and results may not generalize. This study examines the injuries, illnesses, medical evacuations, and nonmedical incidents of the Northwest Outward Bound School (NWOBS) to broaden our understanding and demonstrate commonalities within the field.

METHODS

This retrospective database review examined incidents and evacuations on NWOBS expeditions from June 1, 2014 through October 31, 2016. Incident rates, evacuation rates, and incident type frequencies were calculated. Frequencies of incidents during different expedition time periods were compared with a 1-sample χ² test. The odds ratio that each type of incident would require evacuation was calculated and compared with other incident types using Fisher exact test.

RESULTS

The study period included 59,058 program days, 277 incidents, 143 medical incidents, 75 medical evacuations, and no fatalities. Injuries occurred at a rate of 1.64 per 1000 program days and illnesses at a rate of 0.78 per 1000 program days. The most common injuries were strains, sprains, and trauma or infection of the skin and soft tissue. Most injuries occurred while backpacking, hiking, or moving around camp. The most common illnesses were nausea, vomiting, diarrhea, abdominal pain, asthma, respiratory infections, and urinary tract infections. The medical incidents with the highest odds of evacuation were fractures, urinary tract infections, abdominal pain, and asthma.

CONCLUSIONS

Results from the NWOBS database are consistent with those from other expeditionary OE programs. These findings should guide risk-management strategies and staff medical training.

A Survey of Wilderness Medicine Analgesia Practice Patterns

INTRODUCTION

In 2014, the Wilderness Medical Society (WMS) published guidelines for the treatment of acute pain in remote settings. We surveyed wilderness medicine providers on self-reported analgesia prescribing practices.

METHODS

We conducted a prospective, anonymous survey. Respondents were recruited from the WMS annual symposium in 2016. All willing attendees were included.

RESULTS

During the symposium, we collected a total of 124 surveys (68% response rate). Respondent age was 42±12 (24-79) years (mean±SD with range), 58% were male, and 69% reported physician-level training. All respondents had medical training of varying levels. Of the physicians reporting a specialty, emergency medicine (59%, n=51), family medicine (13%, n=11), and internal medicine (8%, n=7) were reported most frequently. Eighty-one (65%) respondents indicated they prefer a standardized pain assessment tool, with the 10-point numerical rating scale being the most common (54%, n=67). Most participants reported preferring oral acetaminophen (81%, n=101) or nonsteroidal anti-inflammatory drugs (NSAID) (91%, n=113). Of those preferring NSAID, most reported administering acetaminophen as an adjunct (82%, n=101). Ibuprofen was the most frequently cited NSAID (71%, n=88). Of respondents who preferred opioids, the most frequently preferred opioid was oxycodone (26%, n=32); a lower proportion of respondents reported preferring oral transmucosal fentanyl citrate (9%, n=11). Twenty-five (20%, n=25) respondents preferred ketamine.

CONCLUSIONS

Wilderness medicine practitioners prefer analgesic agents recommended by the WMS for the treatment of acute pain. Respondents most frequently preferred acetaminophen and NSAIDs.

General Medical Considerations for the Wilderness Adventurer: Medical Conditions That May Worsen With or Present Challenges to Coping With Wilderness Exposure

Participation in wilderness and adventure sports is on the rise, and as such, practitioners will see more athletes seeking clearance to participate in these events. The purpose of this article is to describe specific medical conditions that may worsen or present challenges to the athlete in a wilderness environment.

Injury and illness sustained by human competitors in the 2010 iditarod sled dog race

OBJECTIVE

Alaska's 1049-mile Iditarod Trail Sled Dog Race is the world's longest sled dog race and the flagship event in the sport of sled dog racing. Race conditions are typically harsh. Physicians are not officially enlisted to care for human competitors. Instead, medical needs are met through an informal system of volunteers, local health care providers, and a fleet of bush planes. The goals of this study were to identify the types of human injury and illness experienced and the methods by which these conditions are treated.

METHODS

Competitors in the 2010 Iditarod were surveyed at the halfway point and at the finish of the race. Survey elements included specific types and frequencies of injuries and illnesses, and the sources and types of treatments.

RESULTS

Seventy-one teams entered the race, 62 participated in the halfway point survey, and 55 completed the finish line survey. Ninety-nine injuries were reported by 42 (68%) of the survey respondents. Frostbite was the most common injury, occurring in 20 (31%) of the respondents. Musculoskeletal pain was also commonly reported. Two mushers sustained closed head injuries, with 1 requiring evacuation. Twenty-three mushers (37%) reported an acute nontraumatic condition, most frequently an upper respiratory infection (9 respondents). In most instances, medical conditions were self-managed. Race veterinarians and support staff, as well as local village clinicians, administered the majority of care, typically wound care or oral antibiotic administration.

CONCLUSIONS

Most injuries and illnesses sustained by mushers in the Iditarod are minor and self-treatable. Life-threatening conditions are rare, and the need for an organized medical care system seems low.

Health hazards and medical treatment of volunteers aged 18-30 years working in international social projects of non-governmental organizations (NGO)

The specific health risk profile and diversity of treatments sought by young volunteers participating in international social projects should differ from those of their older colleagues. In the absence of any data to identify whether this was correct, a retrospective analysis was performed using a standardized questionnaire. Questions included what diseases occurred, and details of the frequency and types of treatment sought during their stay - (e.g. self-treatment, medical/dental intervention, or local healer). The 153 participants were aged 18-30 years and worked in a non-governmental organization for >6 months. The participants were: 53% female, mean age 20 years, and mean duration of stay was 11.2 months. Their NGO placement abroad was in Latin America 65.4%, 14.4% in Africa, and 9.8% in Asia. 83% of the young volunteers had received some advice regarding travel medicine before their departure. However, they suffered from more injuries compared to private travellers, and febrile infections were more common when compared to older studies. 21.2% suffered from dental problems and 50% of them sought medical treatment. This study highlights a previously unreported higher risk profile of specific health problems occurring in young NGO volunteers, including some potentially life-threatening diagnoses that differed from their older colleagues and normal travellers. It is recommended that young volunteers should receive age specific, comprehensive pre-departure training in health and safety, first aid, and management of common health problems. A medical check-up upon returning home should be mandatory. The provision of a basic first aid kit to each volunteer before departure is also recommended.

Effect of load mass on posture, heart rate and subjective responses of recreational female hikers to prolonged load carriage

Load carriage has been associated with a risk of upper and lower limb musculoskeletal disorders with women suffering significantly higher injury rates than their male counterparts. Despite this injury risk, there are limited evidence-based guidelines for recreational hikers, particularly female recreational hikers, regarding safe backpack loads. The purpose of the present study was to determine how variations in load mass affected the heart rate, posture and subjective responses of women during prolonged walking to provide evidence for a load mass limit for female recreational hikers. Heart rate (HR), posture and ratings of perceived exertion (RPE) and discomfort were collected for 15 female experienced recreational hikers (22.3 ± 3.9 years) while they hiked for 8 km at a self-selected pace under four different load conditions (0%, 20%, 30% and 40% of body weight (BW)). Although HR was not significantly affected by load mass or walking distance, increasing load mass and distance significantly affected posture, RPE and discomfort of the upper body. Carrying a 20% BW load induced significant changes in trunk posture, RPE and reported shoulder discomfort compared to the unloaded condition. The 20% BW load also resulted in a mean RPE rating of 'fairly light', which increased to 'hard' when carrying a 40% BW load. As load carriage distance increased participants reported significantly increased shoulder, neck and upper back discomfort. Based on the changes to posture, self-reported exertion and discomfort when carrying loads of 20%, 30% and 40% BW over 8 km, it was concluded that a backpack load limit of 30% BW should be recommended for female recreational hikers during prolonged walking.

Injuries Sustained at Yellowstone National Park Requiring Emergency Medical System Activation

OBJECTIVE

Outdoor-related activity has been on the rise in recent years, and hiking and backpacking are among those activities with the largest growth in participation. As the number of participants with varying experience increases, it is expected that there will be an increase in injuries related to these activities. Little empirical data exist related to outdoor injury types and rates. Our objectives were to determine incidence and frequency of injuries related to outdoor activity and requiring emergency medical system (EMS) activation at a national park.

METHODS

This retrospective study examines injuries within Yellowstone National Park. Subjects were selected from a database containing all EMS calls within Yellowstone National Park from calendar year 2003 through 2004. Data collected included age, gender, type of injury, location, activity at the time of injury, and EMS response.

RESULTS

There were 306 injuries reviewed. The mean age of patients was 40.9 years (SD: 23.0), and the group comprised 49.0% males. Emergency medical system transport was not required in 59.2% of injuries, and of those transported, 58.4% of patients required basic life support only. Of all injuries, 77.4% involved soft tissue, including lacerations. Hiking and walking accounted for 38.0% of all injuries, and 56.0% of those injuries involved the lower extremity. Only 8.8% of the injuries involved fractures and/or dislocations.

CONCLUSIONS

In this study of EMS responses at a national park, the majority of injuries sustained were minor in nature. More than one third of injuries occurred while patients were hiking or walking, and most of those injuries involved the lower extremity. These results will help optimize resource planning in the national park setting.

Search Is a Time-Critical Event: When Search and Rescue Missions May Become Futile

OBJECTIVES

The purpose of this study was to derive and validate a rule for duration of search (ie, search time) that maximizes survivors and after which a search and rescue (SAR) mission may be considered for termination.

METHODS

This was a retrospective cohort study of all SAR missions initiated in Oregon over a 7-year period, which were documented in a population-based administrative database. The following types of search missions were excluded from analysis: redundant reports of a single search; lost helicopters and airplanes; support of organized events; law-enforcement searches; searches for persons actively avoiding rescue; body recovery missions; and cases without outcome information. The cohort was divided into a derivation cohort (searches from 1997-2000) and a validation cohort (2001-2003). The primary outcome was survival. Variables considered in the model included age, gender, minimum and maximum daily temperatures, precipitation, search time, and whether the search involved an air or water incident. Missing data were handled using multiple imputation. Classification and regression tree (CART) methods were used to derive the model.

RESULTS

The derivation cohort included 1040 searches involving 1509 victims, 70 (4.6%) of whom died. The validation cohort included 1262 searches involving 1778 victims; 115 (6.5%) died. Search time was the only variable retained in the final model, with a cut-point of 51 hours. The derivation model was 98.9% sensitive; the same model run using the validation cohort was 99.3% sensitive.

CONCLUSIONS

This time-based model may aid search managers in the decision about starting a search or changing search tactics for missing persons.

Search and Rescue in Yosemite National Park: A 10-Year Review

OBJECTIVE

To describe the general characteristics and epidemiology of search and rescue (SAR) in Yosemite National Park (YNP) and identify possible areas for intervention directed at reduction in use of these services.

METHODS

Yosemite Search and Rescue (YOSAR) personnel record every search and rescue mission on a Search and Rescue Incident Report. The information contained in these reports was used to perform a retrospective review of all SAR missions within YNP during the 10-year study period between January 1990 and December 1999.

RESULTS

YOSAR performed 1912 SAR missions, assisting 2327 individuals and recording 2077 injuries and illnesses. Popular trails in and around Yosemite Valley collectively accounted for 25% of all individuals needing SAR services. Lower extremity injuries and dehydration/hypovolemia/hunger were commonly identified reasons to need SAR services. The duration of SAR missions averaged 5 hours, used 12 SAR personnel, and cost $4400. Helicopter was the primary mode of transport in 28% of SAR incidents. There were 112 fatalities, yielding a SAR case fatality rate of 4.8%. The majority of fatalities occurred while hiking/snowshoeing, with falling the most common mechanism of lethal injury.

CONCLUSIONS

Day-hikers in and around Yosemite Valley use a large portion of SAR services, with lower extremity injuries and dehydration/hypovolemia/hunger the most common reasons. It seems reasonable to direct future intervention to prevention of these commonly identified problems in this particular population of Park visitors.

Wilderness event medicine: planning for mass gatherings in remote areas

BACKGROUND

An increasing number of large recreational events are taking place in remote environments where medical care is far away. Such events include adventure races and large outdoor trips. Wilderness event medicine (WEM) has been previously defined as the healthcare response at any discrete event with more than 200 persons located more than 1h from hospital treatment. However, there is little literature describing the steps for providing medical care at such events.

METHODS

This article provides a framework for planning and executing WEM. It reviews the published data on wilderness injury and illness rates and describes the nature of injuries as they relate to specific activities. The article then discusses the three stages of WEM: pre-event planning, medical treatment at the event, and post-event tasks.

RESULTS

Wilderness events include myriad activities, including orienteering, mountain biking, mountaineering, and whitewater paddling. The injury and illness rates are in the range of 1-10 per 1000 person-days of exposure, with rates one order of magnitude greater for events which last many days, include extremes of environment (heat, altitude), or are competitive in nature. Professional adventure racers may present for medical evaluation at rates as high as 1000 encounters per 1000 racer-days. Injuries depend largely on activity. Illnesses are mostly gastrointestinal, 'flu-like' malaise, or related to the event environment, such as humidity or altitude. Providing medical care requires the proper staff, equipment, and contingency plans. The remoteness of these events mandates different protocols than would be used at an urban mass gathering.

CONCLUSIONS

WEM will likely continue to grow and evolve as a specialty. Additional reports from wilderness events, perhaps facilitated through a web-based incident reporting system, will allow medical providers to improve the quality of care given at remote events. Research into wilderness activity physiology will also be useful in understanding the prevention and treatment of injuries and illnesses encountered.

An introduction to wilderness medicine

As individuals increasingly recreate in wilderness settings, the medical community is faced with increasing numbers of injuries and illnesses occurring in remote and austere locations. In response to this, the specialized and dynamic field of wilderness medicine has developed to care for and counsel those participating in wilderness pursuits. This article adds clarity to the definition of wilderness medicine and examines the current state of wilderness medicine, including the scope of practice in the United States.

Influence of hygiene on gastrointestinal illness among wilderness backpackers

BACKGROUND

Gastrointestinal illness is a common risk for wilderness travelers, even among those who consistently disinfect their water, yet the importance of hygiene has not been characterized.

METHODS

In a prospective surveillance study, 334 Appalachian Trail backpackers who hiked for at least 7 days in 1997 were interviewed. Upon completion of their hike, a written questionnaire was sent, addressing illnesses, water disinfection methods, and hygiene. Hygiene inquiries focused on the frequency of behaviors concerning handwashing and cleaning cookware.

RESULTS

Two hundred and eighty backpackers compiled 38,940 wilderness exposure days, with 56% (n=56) experiencing diarrhea. Diarrhea correlated with the frequency of drinking untreated surface water (relative risk (RR) 2.4, 95% confidence interval (CI) 1.0-4.7%, p5.03). Of those who consistently treated water, 45% suffered from diarrhea, whereas 69% of those who inconsistently treated water experienced diarrhea (RR 0.65, 95% CI 0.53-0.81%, p5.001). Hikers practicing "good hygiene", defined as handwashing post-defecation and cleaning cookware routinely, were less likely to ever experience diarrhea (RR 0.47, 95% CI 0.22-0.99, p5.04). Routine handwashing with soap and water after both urination and defecation reduced the risk of diarrhea (RR 0.11, 95% CI 0.04-0.31%, p,.001). In a case-control analysis of those experiencing diarrhea, decreased diarrhea was associated with routine consumption of multivitamins (RR 0.50, 95% CI 0.37-0.66%, p,.001), routine cleaning of utensils with warm, soapy water (RR 0.38, 95% CI 0.20-0.74%, p,.01), and post-defecation handwashing with soap and water (RR 0.61, 95% CI 0.39-0.93%, p5.006).

CONCLUSIONS

Lack of hygiene, specifically handwashing and cleaning of cookware, should be recognized as a significant contributor to wilderness gastrointestinal illness. Hikers should routinely disinfect water and avoid untreated surface water.

A seven-year experience in expedition medicine: the Juneau Icefield Research Program

There have been relatively few attempts to document the optimal medical support for wilderness expeditions, and none of these previous reports includes physician-level providers. Here we document our experience with physician-level medical support to an annual wilderness expedition in Alaska. This report utilizes data collected from 1994 to 2000 as part of the medical response to the Juneau Icefield Research Project, an annual research expedition to the Alaskan wilderness involving up to 60 students and professors. Medical supplies and equipment were catalogued, and 7 years of medical logs were reviewed with data presented in descriptive fashion. The majority of diseases encountered included gastrointestinal illness, minor orthopedic injuries, urinary tract infections, illness related to sun exposure, and kidney stones. Several patients required evacuation by helicopter to the nearest medical facility. The logistical challenges of medical treatment in this setting are discussed.

First aid knowledge of alpine mountaineers

OBJECTIVE

The study evaluates the knowledge of first aid in mountaineerers who climb routes of moderate difficulty in the western Alps. Additionally the mountaineer's ability to assess their own knowledge was investigated. An analysis of the mountain accidents in the same area showed the real need for knowledge.

DESIGN

An investigation of a cohort of mountaineers who reached Margherita Hut (4559 m, Monte Rosa; n=283; 17 questions with five answers each (11 themes)).

RESULTS

Knowledge in general is poor. Best results were obtained in relation to cardiac emergencies, altitude sickness, and hypovolaemic shock, and worst resulted with hypothermia, traumatic injuries, treatment of pain and management of emergencies. Although traumatic injuries represent about 50% of mountain accidents in the region, there was a general lack of basic knowledge on this subject. Self-assessment of the individuals level of knowledge and their need for further education was inadequate. Differences between sex, age, nationality, mountaineering professional experience (medical education) are discussed.

CONCLUSION

First aid education of mountaineers must be improved. Adequate education should take into account the specific demands of alpine emergencies.

Medical risks of wilderness hiking

PURPOSE

We sought to determine the extent to which injuries and illnesses limit long-distance or endurance outdoor recreational activities.

METHODS

In a prospective surveillance study, 334 persons who hiked the Appalachian Trail for at least 7 days (mean [+/- SD] length of hike, 140 +/- 60 days) in 1997 were interviewed. At the end of their hike, subjects completed a questionnaire on injuries, illnesses, water purification methods, and hygiene practices.

RESULTS

Of the 280 backpackers who responded (a combined 38,940 days of wilderness exposure), 69% (n = 192) achieved their goal. The most important reasons for ending a hike prematurely were injury, time limitation, and psychosocial reasons. The most common medical complaints were feet blisters (64%; n = 180), diarrhea (56%, n = 156), skin irritation (51%, n = 143), and acute joint pain (36%, n = 102). The incidence of vector-borne disease was 4% (n = 11); physician-diagnosed Lyme disease was the most common, and 24% of hikers (n = 68) reported tick bites. The risk of diarrhea was greater among those who frequently drank untreated water from streams or ponds (odds ratio [OR] = 7.7; 95% confidence interval [CI]: 2.7 to 23; P <0.0001), whereas practicing "good hygiene" (defined as routine cleaning of cooking utensils and cleaning hands after bowel movements) was associated with a decreased risk (OR = 0.46; 95% CI: 0.22 to 0.97; P =0.04).

CONCLUSION

Diarrhea is the most common illness limiting long-distance hikers. Hikers should purify water routinely, avoiding using untreated surface water. The risk of gastrointestinal illness can also be reduced by maintaining personal hygiene practices and cleaning cookware.

Wilderness medicine

Wilderness medicine is not a single entity. It encompasses clinical practice, instruction, and research as they pertain to wilderness settings. Clinical practice often takes place in removed settings far from traditional medical resources and facilities. Many of the conditions treated are unique to wilderness medicine. Decisions commonly are based on limited information. Practitioners of wilderness medicine must combine specialized training, resourcefulness, and improvisation. Instruction and research in wilderness medicine often are directed at clinical practice, with the focus on maximizing patient outcome. Preparation and planning are the best methods of reducing illness and injury; these involve conditioning and choosing clothing and equipment, including the medical kit. Conditioning should mimic the type of trip or activity, because choice will depend on the type, complexity, and duration of the trip, the anticipated environmental conditions, and specific needs of the group. Equipment should be designed for the type of activity, in good working condition, and familiar to the members of the group. The medical kit should include basic medical supplies, with additional supplies and equipment depending on the specific trip, the anticipated needs of the group, and their level of medical training and expertise. Once in the wilderness, the focus shifts from preparation and planning to prevention of illness and injury. This includes the use of safety equipment, appropriate shelter, water treatment, and location knowledge. The most common methods of water treatment are mechanical filters, chemicals, and heat. When an injury or illness does occur in the wilderness, proper assessment of the patient is essential to determine both the appropriate treatment and the need for evacuation to definitive care. This is best accomplished with an organized, systematic approach. The decision of what treatment should be initiated and if the patient requires evacuation to definitive care often is difficult. There are four phases of an SAR event: location, access, stabilization, and evacuation. Evacuation may require the assistance of organized search and rescue services.

Wilderness mortalities: a 13-year experience

STUDY OBJECTIVE

To analyze the epidemiology of wilderness mortalities in a localized area with diverse terrain.

METHODS

We conducted a retrospective review of the Pima County (Arizona) Sheriff's Office (PCSO) search and rescue logs and case reports, hospital records, and autopsy reports for all wilderness deaths from 1980 to 1992. The study group comprised all victims of injury or illness in Pima County wilderness who died during a 13-year period in a location remote enough so that standard ground-based emergency medical services units could not extract the body.

RESULTS

One hundred fatalities occurred during the 13-year study period. There were 59 unintentional traumas, 18 suicides, 9 homicides, 12 medically related deaths, and 2 deaths of unknown causes. Toxicology tests performed on body fluids yielded positive findings for alcohol in a total of 50 (50%) cases and positive findings for drugs of abuse in 12 (12%) cases. It was estimated that alcohol was "a very probable" or "a probable" causative factor in 23 (40%) of the 59 unintentional trauma deaths, and in 1 (8.3%) of the 12 medically related deaths. Fifty-five (55%) deaths were witnessed events, with 45 (80%) of these victims reported as dying immediately or before arrival of search and rescue personnel. Ten (10%) victims received resuscitation in the field, and according to a review of hospital charts and autopsy reports, only 2 victims had a potentially survivable injury or illness.

CONCLUSION

Many wilderness mortalities are related to incidents involving alcohol. Once the accident or injury has occurred, the majority of deaths are immediate, or at least before the arrival of medical personnel. Higher levels of medical care would not have improved the outcomes of those who did survive long enough to receive medical care. Therefore, primary efforts to reduce mortalities in the wilderness should be directed toward prevention, especially diminishing alcohol use in wilderness areas.

Pediatric wilderness recreational deaths in western Washington State

STUDY OBJECTIVE

To determine the causes and characteristics of pediatric recreational wilderness deaths.

METHODS

All deaths of children between 12 months and 20 years of age involving a wilderness recreational activity in 5 western Washington counties between 1987 and 1996 were identified by medical examiners' logs. Univariate analysis was used to examine variables such as age, gender, activity, mechanism of injury, adult presence, blood alcohol level, safety equipment, and mode of evacuation.

RESULTS

Of 40 cases meeting inclusion criteria, 90% involved male subjects and 83% of victims were 13 to 19 years old. Hiking (33%), swimming (20%), and river rafting (10%) were the most common activities. Death was most often by drowning (55%) or closed head injury (26%). No victim was alone. All children younger than 10 years of age were accompanied by an adult, in contrast to only 26% of individuals 10 years or older. Only 4 victims had drugs or alcohol in their system. No victim wore a personal flotation device or helmet, and only 5% had foul weather gear. Although nearly one third of victims were transported by airlift, more than half of the victims were dead at the scene.

CONCLUSION

Males and teenagers were the 2 major risk groups for recreational wilderness deaths. Traditional activities such as hiking and swimming were the most common causes of death. Children younger than 10 years died despite the presence of an adult, whereas teenagers were usually with groups of peers. The majority of victims were not prepared for adverse events with basic safety equipment.

An analysis of the medical review process at the National Outdoor Leadership School

A statistical analysis of the medical characteristics of students on field courses at the National Outdoor Leadership School (NOLS) was performed. This analysis determined that the group of students with the highest overall student scores (> or = 4 on a 1 through 5 scale) tended to score lower in the psychological counseling and current psychological treatment questions and scored significantly higher in the athletic ability question on the NOLS medical review form. This indicates that these individuals tended to have little or no history of counseling and psychological treatment and were more likely to be engaged in competitive sports. Discriminant analysis demonstrated that these variables also contributed the most to discerning mathematically among the four possible student outcome score groups, which ranged from the inability to complete a course (evacuation) through highly successful. Many of the questions on the current NOLS medical form could not be analyzed statistically because they demonstrated no variance among the groups. Although these questions may still be valuable for screening purposes, some of them could be reworded for increased sensitivity. Discriminant analysis of six responses on the medical form was 43.7% effective at classifying individuals to outcome groups, and it is likely that this could be more effective with some modifications to the evaluation process. Admissions personnel in outdoor programs are encouraged to include questions such as those mentioned above in their overall admission procedures and to examine them thoroughly in their admissions decisions. Although additional studies should be conducted to examine these issues more thoroughly, it is possible that programmatic changes would assist students without the above-mentioned characteristics in becoming more successful in field courses.

Injury and illness in a wilderness multisport endurance event

Our objective was to identify patterns of injury and illness and develop possible preventive strategies for competitors in a wilderness multisport endurance event. Using a prospective observational cohort study during the Winter Classic, a 2-day wilderness multisport endurance event held in rugged alpine terrain in Victoria, Australia, we sought details of demographics, pre-, intra-, and postrace injuries and illness. We employed chi-squared tests and iterative multivariate analysis. There were 33 respondents with 26 (78%) aged between 26 and 35 years. Seven (21%) developed symptoms consistent with exposure, and three (9%) developed asthma during the race. Competitors in the marathon pairs class had a 50% risk of exposure vs 12% for the individual class (p = 0.031). The number of times raced, nonsteroidal anti-inflammatory drug use, and increasing age were the other independent significant predictors of exposure. Twenty-three (70%) of the competitors were injured at some time during the race. The day 1 run was more commonly associated with injuries than other stages (39% injured, p = 0.0037). Increased amounts of training, previous musculoskeletal problems, and increased number of previous race attempts were all significant independent predictors of injury. Most competitors (67%) suffered musculoskeletal problems after the race, these typically being of the thighs and calves, but only two competitors required time off from their normal activities. We concluded that injuries in wilderness multisport endurance events are common, particularly in the run stages. These injuries are usually minor, but their frequency makes major injury an ever-present risk. Both injury and illness are more frequent in those who compete while carrying injuries. These events are high risk for the development of injuries and illness and require a high level of competitor preparation and readily available medical support.

Advanced life support in the wilderness: 5-year experience of the Reach and Treat team

Increasing recreation in the wilderness raises questions about the value of providing advanced life support (ALS) care in the backcountry. Since 1989 the Reach and Treat (RAT) team has provided ALS care in the wilderness area that surrounds Mount Hood, Oregon. The purpose of our study was to describe patient demographics, terrain, injuries, and ALS treatment in the wilderness environment. We utilized a retrospective, observational analysis of RAT missions from 1989 to 1994 based on data sheets maintained by the RAT team, prehospital run sheets, and hospital charts. Of the 114 missions analyzed, the median time of missions was 3 h, 9 min (range, 44 min-76 h) and 20% required technical climbing skills. Of the 74 patients treated, 55 (90%) received ALS care: 8 were intubated, 52 had intravenous lines established, and 24 received morphine for pain. Twenty patients were entered into the local trauma system. The most common injuries were extremity injuries (58), head injuries (18), and hypothermia (15). Mean time from arrival to return to staging area was 95 min. No injuries to RAT team members occurred during these missions, although two minor injuries occurred during training and testing. We found that wilderness-trained paramedics safely provided ALS care in a backcountry environment. This care may improve patient comfort during long extrication and speeds the arrival of potentially life-saving interventions such as advanced airway management.