"Pacemaker heart sound" caused by diaphragmatic contractions.
D000368:Aged; D003964:Diaphragm / Q000502:physiology*; D004562:Electrocardiography; D005260:Female; D005471:Fluoroscopy; D006326:Heart Auscultation; D006801:Humans; D009119:Muscle Contraction; D010138:Pacemaker, Artificial; D010701:Phonocardiography