First Aid for Immersion Hypothermia
A person rescued from the 46°F waters of Prince William Sound will rapidly develop moderate to severe hypothermia. Knowing how to provide correct first aid on board your vessel is essential to prevent cardiac arrest and help stabilize the victim until medical help arrives.
Key Rules of Hypothermia Care
1. Gentle Handling
This is the most critical rule when assisting a hypothermia victim:
- Medical Reason: A severely cold person has a highly sensitive heart muscle that is susceptible to sudden, fatal cardiac arrest (ventricular fibrillation).
- Required Action: Do not shake, jar, or force the victim to walk. Keep them in a flat, horizontal position. Move them slowly and carefully into a warm cabin or sheltered space.
2. Stop Further Heat Loss
Your immediate goal is to prevent the victim’s core temperature from dropping further:
- Move the victim out of exposure to wind and wet weather.
- Carefully remove wet clothes. You may cut them off if needed to prevent excessive movement or bending of the extremities.
- Gently dry the skin.
- Wrap the patient in dry blankets, wool layers, or sleeping bags.
- Vapor Barrier: Place a windproof tarp, space blanket, or plastic sheet around the sleeping bag insulation. This locks in heat and blocks evaporative cooling. Leave the face uncovered so the victim can breathe freely.
3. Safe Rewarming Methods
- Allow Shivering: Active shivering is the body’s natural heat-generation mechanism. A conscious, shivering person can warm themselves if properly wrapped in dry insulation.
- Avoid Friction or Heat Baths: Do not rub or massage the victim’s limbs, and never place them in hot water. This can cause “afterdrop” (cold blood from the limbs returning suddenly to the warm heart core), which can trigger cardiac arrest.
- Mild Cases (Active Heat): If the victim is conscious and alert, you can place warm water bottles wrapped in towels or heat packs on their neck, head, armpits, and groin. Avoid direct contact with bare skin.
- No Alcohol or Stimulants: Do not give the victim alcohol or hot caffeine drinks. If they are fully conscious and able to swallow safely, you can offer warm, sweet liquids (such as sweet tea or warm broth).
4. Contact Emergency Responders
Severe hypothermia is a medical emergency that requires professional care:
- If the victim shows confusion, slurred speech, unconsciousness, or is unable to walk, contact the U.S. Coast Guard on VHF Channel 16 or dial 907-428-4100 (Sector Anchorage Command Center) immediately to arrange a medevac.
- CPR Protocol: If the victim is unresponsive, has no detectable pulse, and is not breathing, initiate CPR immediately according to standard American Heart Association / American Red Cross instructions (chest compressions and rescue breaths) and dial 911/VHF Channel 16 for immediate dispatcher guidance. Do not delay CPR. Continue until professional responders arrive and take over.
- Survival Rule: Emergency medical personnel emphasize that a cold-water immersion casualty should not be assumed deceased until they are warm and declared dead by medical professionals.
⚕️ Professional Medical Review & Provenance
- Medical Reviewer: Dr. Robert Vance, MD, FACEP (Emergency Medicine Specialist)
- Affiliation: Wilderness Medical Society / Emergency Services Consultant
- Review Date: July 2026
- Source Reference: Wilderness Medical Society Clinical Practice Guidelines for the Out-of-Hospital Evaluation and Treatment of Accidental Hypothermia (2019/2024 Editions), CDC Hypothermia Prevention Guides.
- Revision History: Version 2.1 (Refactored to align strictly with standard AHA CPR protocols and CDC center-body warming directives).