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(Chest. 1971;60:79-81.)
© 1971 American College of Chest Physicians

The Initial Component of the First Heart Sound

A. A. Luisada M.D., F.C.C.P.1 and B. Argano M.D.1

1 Divisions of Cardiology (Medicine) and of Cardiovascular Research (Physiology) of The Chicago Medical School, University of Health Sciences, Chicago, Illinois

The first heart sound is initiated by a slow deflection in the phonocardiogram. This early wave follows mitral valve closure and precedes the rapid rise of pressure in the left ventricle. It is also present in cases with atrial fibrillation, mitral insufficiency, or mitral stenosis. This component, called o, is explained as resulting from the early stage of left ventricular contraction.






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Copyright © 1971 by the American College of Chest Physicians.