Present Status of Intracardiac Phonocardiography

Abstract

The use of an underwater barium titanate microphone placed at the tip of a special designed cardiac catheter allows the direct study of the origin and transmission of heart sounds and murmurs. Thus the intensity of the 1st, 2nd, 3rd and 4th heart sounds can be compared in the various chambers. Its greatest value lies in precise localization of sounds and murmurs.