Prevalence of the fourth heart sound by phonocardiography in the absence of cardiac disease.
D000367:Age Factors; D000368:Aged; D000375:Aging; D003327:Coronary Disease / Q000503:physiopathology; D004562:Electrocardiography; D006331:Heart Diseases / Q000503:physiopathology; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D008875:Middle Aged; D010701:Phonocardiography; D012214:Rheumatic Heart Disease / Q000503:physiopathology