Why must blood flow to the limbs remain low near someone suffering from hypothermia?
Blood flow needs to kept slow whilst a creature is in the acute stages of hypothermia because if vasoconstriction (widening of the veins) occur too quickly, next colder blood rushes to the surface and could possibly cause a heart attack or stroke.
Medical treatment aims to thaw out up the body from the inside. Doctors do this by giving warm fluids intravenously (through a vein). In some cases, haemodialysis may be used. This is a treatment to whip blood out of the body and warm it up up to that time returning it. The blood is filtered through an artificial kidney, much approaching dialysis treatment for people beside kidney failure.
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