Variability in the detection of a fourth heart sound--its clinical significance in elderly subjects.
D000368:Aged; D000375:Aging; D001161:Arteriosclerosis / Q000175:diagnosis; D002341:Carotid Artery Thrombosis / Q000175:diagnosis; D004562:Electrocardiography; D005260:Female; D006326:Heart Auscultation; D006331:Heart Diseases / Q000175:diagnosis*; D006337:Heart Murmurs; D006347:Heart Sounds; D006801:Humans; D006984:Hypertrophy / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D010701:Phonocardiography