Environmental Myth-busting

Environmental emergencies are full of persistent myths that can worsen injury at the bedside and in the field. Snakebite, jellyfish envenomation, heat stroke, drowning, and hypothermic arrest all have a few high-yield truths that matter more than folk remedies or outdated terminology.

Snakebite and marine envenomation

• Harmful snakebite first aid: Venom extractors, wound cutting, and tourniquets do not remove venom and can worsen local tissue injury through ischemia, infection, or delayed definitive care.
• Early envenomation clues: Progressive warmth, redness, joint involvement, and expanding tissue injury are the bedside signs that matter most when deciding who may need antivenom evaluation.
• Antivenom workup basics: Serial exams plus coagulation studies and a DIC panel are the key early tests in suspected snake envenomation, and toxicology input is worth getting early in the episode.
• Jellyfish rinse myth: Urine and other freshwater rinses can trigger additional nematocyst discharge, so the safer first move is visible tentacle removal followed by saltwater irrigation.
• Species-specific sting care: Vinegar is not a universal jellyfish treatment; it may help some species but worsens pain with blue bottle jellyfish, a distinction we get into in the chapter.
• Box jellyfish danger: Box jellyfish in northern Australia can cause sudden life-threatening cardiac arrhythmias, which is why local species knowledge and poison center guidance matter.

Heat illness, drowning, and hypothermia

• Sweating does not reassure: Heat stroke is not ruled out by diaphoresis; altered mental status in a hot environment is the red flag that should drive aggressive cooling.
• Cooling method hierarchy: Evaporative cooling works, but ice-water immersion in a body bag cools roughly twice as fast, and we walk through when that speed matters on the show.
• Drowning electrolyte myth: Saltwater versus freshwater drowning does not usually produce major electrolyte differences in humans because aspirated volumes are typically too small.
• Preferred drowning terminology: Use drowning or submersion injury rather than near drowning, dry drowning, or secondary drowning; standardized language improves communication and outcome reporting.
• Hypothermic arrest endpoint: Severe accidental hypothermia can be neuroprotective, and resuscitation generally continues until successful rewarming above 32 C unless injuries are clearly nonsurvivable.
• Termination red flags: A potassium above 12 mEq/L, impossible chest compressions, or avalanche burial with packed airway and prolonged asystole are major clues that continued efforts may be futile.

References:

1. Kanaan NC, Ray J, Stewart M, et al. Wilderness Medical Society Practice Guidelines for the Treatment of Pitviper Envenomations in the United States and Canada. Wilderness Environ Med. 2015;26(4):472-487. PMID: 26433731
2. Dow J, Giesbrecht GG, Danzl DF, et al. Wilderness Medical Society Clinical Practice Guidelines for the Out-of-Hospital Evaluation and Treatment of Accidental Hypothermia: 2019 Update. Wilderness Environ Med. 2019;30(4S):S47-S69.PMID: 31740369
3. Schmidt AC, Sempsrott JR, Hawkins SC, et al. Wilderness Medical Society Clinical Practice Guidelines for the Treatment and Prevention of Drowning: 2019 Update. Wilderness Environ Med. 2019;30(4S):S70-S86.  PMID: 31668915
4. Lipman GS, Gaudio FG, Eifling KP, et al. Wilderness Medical Society Clinical Practice Guidelines for the Prevention and Treatment of Heat Illness: 2019 Update. Wilderness Environ Med. 2019;30(4S):S33-S46.  PMID: 31221601
5. Parker-Cote J, Meggs WJ. First Aid and Pre-Hospital Management of Venomous Snakebites. Trop Med Infect Dis. 2018;3(2):45. Published 2018 Apr 24. PMID: 30274441
6. Devlin JJ, Knoop KJ. Marine Trauma and Envenomation. In: Tintinalli JE, Ma O, Yealy DM, et al, eds. Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9e. McGraw Hill; 2020. Accessed May 30, 2023.