Pacemaker sound and its origin.
D004566:Electrodes; D006326:Heart Auscultation; D006801:Humans; D007366:Intercostal Muscles; D009119:Muscle Contraction; D009991:Oscillometry; D010138:Pacemaker, Artificial; D010701:Phonocardiography; D011845:Radio; D012119:Respiration