This is part 1 of a multi-part series on the resuscitation of critically buried avalanche victims. In this episode we learn the physiology that we need to understand the resuscitation algorithm. To learn the necessary biology, we follow a rider as they are carried in an avalanche, subjected to traumatic injury, and are then buried and begin to asphyxiate and cool. 

The background of this episode is useful to understand why:
-Cardiac arrest from trauma is usually unsalvageable;
-Arrest due to hypoxia can happen within minutes or be delayed more than an hour;
-Why we care if someone is really, really cold;
-Why potassium measurement is useful in the hospital treatment of severe hypothermia;
-And why we can largely forget about that other gas, CO2.

Look out for the next episode, where I''ll dive into the ICAR Avalanche Victim Resuscitation Algorithm.

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