Fig. 1.

(A) Documented VF recorded in the automated external defibrillator. Return of spontaneous circulation was subsequently documented after cardioversion and the heart rhythm gradually recovered to sinus rhythm (arrow). (B) The 12-lead ECG on admission. ER was observed in the inferior leads. The QRS duration of the PVB was 128 ms (relatively narrow). The QT interval was 410 ms. (C) ER in the inferolateral leads became prominent when the patient underwent hypothermic treatment as compared to the ER during normothermia. (D) Holter ECG monitoring during hospitalization. (D-1) Increased PVBs and NSVTs were documented during the day and occasionally broke out into a short coupling interval (300 ms). (D-2) ER became prominent during the night or during periods of decreased heart rate, and PVBs were rarely documented at those times. CV=cardioversion and HR=heart rate.