The pacemaker sound.
D000368:Aged; D006328:Cardiac Catheterization; D002339:Carotid Arteries / Q000502:physiology; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000503:physiopathology; D006326:Heart Auscultation; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D010701:Phonocardiography; D011674:Pulse; D013902:Radiography, Thoracic; D013909:Thorax / Q000502:physiology