As temperatures continue to drop, the ECG will demonstrate prolonged intervals: PR, followed by QRS and then QTc.
An increased PR interval, a widened QRS complex, and a prolonged QT interval signal progressing hypothermia.
[…] of the PR, QRS, and QT intervals, in that order. 17 There also may be T wave changes that mimic myocardial ischemia. 17 Below 32.2 C (90 F), atrial and ventricular dysrhythmias