Fig. 1

ECG tracings of the patients (25 mm/s,10 mm/mV). a Atrial fibrillation (sinus:131 bpm) (d + 9) b Premature onset,sinus arrest or sinus block (d + 18). Sudden chest tightness, shortness of breath, followed by ass attack was occurred. c Borderline escape rhythm with sinus capture (d + 22). A temporary heart pacemaker had been placed for 3 days. d Spontaneous rhythm and pacemaker heart rate alternately appear (d + 28)