Standardization of Phonocardiography

Intracardiac phonocardiography in man.

This paper describes a new method for the detection of sound from within the heart in man. It employs the technic and equipment of underwater listening developed and use(l by the Navy in antisubmarine warfare. Records are shown to illustrate the localization of heart sound production to an extent not possible by phonocardiograms from the chest wall. The technic has proved helpful in the evaluat...

Present status of intracardiac phonocardiography.

T HE most important aspect of our studies has been the observation that this technic, using the underwater barium titanate microphone, p)rovidei an exact localization of the production of heart sounds and murmurs. Figure 1 illustrates the iiormal intracardiac phonocardiogrami from the various chambers of the heart and from the great vessels. Several points may be made: 1. Comparison of similar ...

Phonocardiography in patent ductus arteriosus.

Phonocardiography in acute rheumatic carditis.

The diagnosis of early rheumatic carditis usually depends upon the detection of murmurs produced by acute valvulitis. It may be difficult to evaluate clinically the significance of certain murmurs occurring in patients with rheumatic fever, though the development of a loud apical pansystolic murmur in a patient already under observation usually presents no diagnostic problem. More frequently a ...

The assessment of mitral stenosis by phonocardiography.

Clinical assessment of the severity of mitral stenosis sometimes presents difficulties. The symptoms may be obscured by superadded effort syndrome or by limitation of activity imposed by the patient's doctor. The physical signs may reveal the presence of pulmonary hypertension or heart failure, but in their absence there may be little indication as to the size of the mitral orifice. The intensi...