Phonocardiographic Studies in Mitral Stenosis

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Abstract
THE widespread employment of surgery for the relief of mitral stenosis has made it desirable to have some objective measure of the success of the operation. At times the patient's subjective observations after surgery have been more enthusiastic than the data obtained by precise methods appear to justify.1 Some of the most valuable information regarding changes in circulatory dynamics before and after fracture of the valve has been afforded by catheterization,2 as well as by direct puncture of the chambers of the left side of the heart at the time of surgery.3 These methods, however, are cumbersome. It would be . . .