Severe bradycardia following electrical cardioversion for atrial tachyarrhythmias in patients with acute myocardial infarction.

Bradycardia following electrical cardioversion is an uncommon complication. The present report describes three patients who developed life-threatening bradycardia following electrical cardioversion for atrial tachyarrhythmias in the setting of an acute myocardial infarction. All three patients had multivessel coronary artery disease with a totally occluded right coronary artery and a possibility of ischemic sinus node dysfunction. When electrical cardioversion is undertaken for new onset of atrial tachyarrhythmia in the setting of an acute myocardial infarction, measures for immediate, temporary pacing should be easily available.