COLD CLIMATE CPR: WARM AND DEAD
10 min · Free lesson · written lesson, video in production
After this lesson you know how cardiac arrest changes in the cold: why CPR continues far longer than city training taught you, why nobody is pronounced dead until they are warm and dead, and how to run a resuscitation in the snow while help is still hours out.
The Technique
- Cold changes the rules of resuscitation, in the casualty's favour: a cold brain needs far less oxygen, and severely hypothermic people have survived cardiac arrest for hours - with full recovery - because the cold protected them. That is the foundation of the doctrine every mountain rescuer carries: nobody is dead until they are warm and dead.
- What that means in practice: in the backcountry you do not stop CPR on a cold casualty because time has passed or because they look beyond help. Resuscitation continues - through the wait, through the evacuation - until professionals have rewarmed them and made the call, unless the injuries are plainly incompatible with life. Hope, in the cold, is physiology.
- Check long before you start: a severely hypothermic person can have a pulse so slow and faint it hides - feel for a full sixty seconds at the neck, watch for any breathing. Starting compressions on a barely-beating cold heart can tip it into arrest, so the check is slower and more careful than warm-weather training taught.
- Handle like glass, always: rough movement, sudden vertical lifts and limb manipulation can trigger arrest in a cold heart - rescue collapse. Cut clothing rather than wrestle it, move the casualty level and gently, and package flat.
- If there is no breathing and no pulse after the long check: standard CPR, best possible quality, on the firmest insulated surface you can build - compressions do not work on soft snow, so a mat, a board or dug-down firm snow goes underneath. Swap compressors every two minutes; cold rescuers fatigue fast, and this may run for hours.
- The parallel jobs, because CPR alone is not the plan: insulation under and over the casualty as the resuscitation runs, the evacuation call upgraded to cardiac arrest with hypothermia stated clearly - it changes hospital destination to one that can rewarm - and the rest of the group warming, feeding and rotating the compressors.
- An AED still belongs in the picture if your operation carries one: attach it, follow it, and know that a very cold heart may not respond to shocks until it warms - the machine and the guidelines handle that; your job is compressions and insulation without interruption.
Common Mistakes
Calling it early because the casualty is cold, blue and still. Fix: cold, blue and still is what survivable hypothermic arrest looks like - warm and dead is a hospital's call, not the snow's.
- Perfect CPR on a heat-losing casualty. Fix: compressions and insulation are one job, not a sequence - the cold that protected them keeps deepening unless you wrap as you work.
The Drill
The sixty-second check: on a mate lying in full winter kit, find and hold the neck pulse for a timed full minute, gloves off then gloves on. Then set up a compression station - mat down, kneeling positions for two rotating compressors - in under two minutes. Rehearse the whole setup each winter trip.
This lesson exists to change one decision: how long you keep going. Real CPR competence comes from an accredited course with a manikin and instructor - do one, and refresh it. On avalanche burials, airway and time-under decide outcomes and formal avalanche rescue training applies. This content is general guidance, not medical advice.
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