LAUSR

Introduction Permanent pacemaker failure to capture can occur owing to several causes, including battery depletion, circuit problems, lead dislodgement, metabolic abnormalities, and drugs. Although acute coronary syndrome (ACS) can cause this phenomenon, there are few reports in the literature describing pacemaker malfunction as a consequence of ACS. The effect of temporary myocardial ischemia and reperfusion on myocardial conduction properties is well known in animal models. In the literature, only 2 case reports have described the recovery of stimulation thresholds after reperfusion, and, in both, this occurred after weeks. We report a unique case of pacemaker malfunction associated with acute myocardial infarction (MI) with early normalization of the pacing threshold following angioplasty of the right coronary artery (RCA).