THE PHONOCARDIOGRAM OF AORTIC STENOSIS

Abstract

Aortic stenosis produces a systolic murmur of characteristic shape in the phonocardiogram both in the aortic and mitral areas. Sound records were taken in 20 patients with aortic stenosis. Thq phonocardiograph used for this investigation has been described elsewhere Filters were u-sed to reduce the intensity of the low frequencies to about the same extent as effected by the human hearing mechanism; the resulting curve is called high frequency or logarithmic Records from the aortic and mitral areas were often made simultaneously. In each patient there was good clinical evidence of aortic stenosis and in 13 of them calcification of the aortic valve was seen on fluoroscopy. Any patient with a mitral diastolic