Electrocardiographic issues related to action potential phases 1 and 2 on the occasion of a case of accidental mild hypothermia.

A 29-year-old man was accidentally exposed to cold and his mild hypothermia uniquely resulted in the transient exaggeration of his normothermic electrocardiographic findings, which were consistent with early repolarization. A unifying concept of clinical entities with similar J wave and ST segment elevation (J-ST syndrome) is proposed.