title: Malfunctioning pacemaker.
mesh_terms: D001021:Aortic Valve / Q000601:surgery; D001145:Arrhythmias, Cardiac / Q000209:etiology; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D011183:Postoperative Complications