injuries poisoning
Hypothermia
Symptoms and Signs of Hypothermia
Intense shivering occurs initially, but it ceases below about 30° C, allowing body temperature to drop more precipitously. Central nervous system dysfunction progresses as body temperature decreases; people do not sense the cold. Lethargy and clumsiness are followed by confusion, irritability, sometimes hallucinations, and eventually coma. Pupils may become unreactive. Respirations and heartbeat slow and ultimately cease. Initially, sinus bradycardia is followed by slow atrial fibrillation; the terminal rhythm is ventricular fibrillation or asystole. 