Arrhythmias.
D000328:Adult; D000337:Aerospace Medicine; D001146:Arrhythmia, Sinus; D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000628:therapy; D004562:Electrocardiography; D006801:Humans; D008004:Licensure; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013610:Tachycardia