Abstract
A 71-year-old man with a history of inferior myocardial infarction was referred to the hospital for management of subarachnoid hemorrhage. The baseline 12-lead electrocardiogram showed sinus rhythm with a left bundle branch block configuration as well as 2:1 atrioventricular (AV) block (Figure 1A). After several hours, the electrocardiogram exhibited a slower rhythm with a right bundle branch block pattern following 2 narrow P waves (red arrows, Figure 1B). The slow ectopic rhythm converted to sinus rhythm after a spontaneous premature ventricular complex (PVC).
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