Osborn Waves of Hypothermia

A12-lead ECG was obtained from a 72-year-old man with a core body temperature of 85°F (Figure 1⇓). The ECG shows severe sinus bradycardia with prolonged PR, prolonged QRS complex, prolonged QT interval, and an extra deflection at the end of the QRS complex (Osborn waves) (arrows). A second 12-lead ECG obtained 24 hours later, after the patient had been rewarmed to 98°F, was normal (Figure …