Abstract
1. 1. A phonocardiographic study was made on twenty-seven patients with syphilitic aortic regurgitation in order to study the auscultatory phenomena at the apex. 2. 2. Some of the patients showed one of the following acoustic phenomena: 2.1. a. The presence of additional sounds during diastole (third sound. auricular sound, or both). 2.2. b. The presence of a “crescendo” type of first sound. 2.3. c. The presence of a split first sound, due either to increased loudness of the two valvular components or to increased loudness of the vascular component. The above-mentioned phenomena may simulate, to the ear, either a diastolic rumble or a presystolic murmur. They were easily recognized on phonocardiographic tracings, so that mitral stenosis was excluded after study of the tracings.
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