Hypothermia

- Patients with moderate (temp <32 C) or severe hypothermia (temp <28 C) are at risk for fatal arrhythmias, which may be precipitated by sudden movements or invasive procedures

- The classic EKG finding is an Osborn wave (J wave). Other common EKG findings are atrial fibrillation, bradycardia, a prolonged PR or QT interval, or motion artefact from shivering

- Worsening hypotension and hypothermia may occur if extremities are rewarmed and vasodilate before the core body temperature rises

- If the patient arrests, don't stop resuscitation until the temperature has normalized!

Here is a fantastic review article for the DDx and step-wise treatment of hypothermia