Hypothermia?
Answers: One explanation for the effect is a cold-induced malfunction of the hypothalamus, the sector of the brain that regulates body temperature. Another explanation is that the muscles contracting lateral blood vessels become exhausted (known as a loss of vasomoter tone) and relax, fooling the entity that things are hotter than they are.
Here is a snippet from a medical journal on the physiological effects of hypothermia on the myocardium (since you may not own a subscription):
It has be suggested that asystole is a primary manifestation of hypothermia, whereas ventricular fibrillation occurs lower to rewarming, hypocapnia, alkalosis or physical manipulation. Ischaemia, increased adrenergic activity and electrolyte disturbances no problem predispose to myocardial irritability, and in moderate hypothermia this frequently results within arrhythmias, commonly atrial fibrillation or flutter or nodal rhythms, but also multifocal ventricular extrasystoles and tachyarrhythmias. Ventricular fibrillation is more common below something like 27 °C, and is particularly plausible to develop if there is a sudden adaptation in parameter such as physical movement, pO2 or pCO2, myocardial temperature, or change in biochemical or acid-base status. It have been postulated that the nouns of a temperature angle between the cooler endocardium and subendocardial conducting tissue and the relatively warmer myocardium facilitate conduction through the myocardium at the expense of normal neuromuscular nouns, which might explain why sudden changes contained by biochemistry or acid end status affect these tissues differently and predispose to the development of ventricular fibrillation. An alternative explanation is that the small heat differentials between myocardium and endocardium may cause dispersion of the performance potential duration, refractory period and conduction speed, which are significantly lengthened within hypothermia, resulting in an increased vulnerability to arrhythmias.
Not as simple answer, but very well researched.....
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