title: Marked sinus tachycardia and overdrive suppression.
mesh_terms: D001146:Arrhythmia, Sinus / Q000175:diagnosis* / Q000628:therapy; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013610:Tachycardia / Q000175:diagnosis* / Q000628:therapy