Abstract
The intracardiac phonocardiographic method of our original conception has been an epock making advance in the study of heart sounds. In this paper with the accumulation of 50 additional clinical cases from the time of original reports the result are summarized and some extra views are expressed.
1) Our equipment utilizing the condensor-type pick up is believed to be for superior to those made and used in Europe and the United States from the view-point of sensitivity and frequency response when compared by actual use.
2) The characteristics of intracardiac sounds were discussed by grouping the deta under the headings of “the effect of blood flow”, “damping due to heart and blood-vessel wall”, “conduction of vibrations”, “Knocking sound”, etc.
3) The various components of the normal heart sounds were divided into the first sound, 2nd sound, 3rd sound, atrial sound, extra sound and murmurs.
The results of the clinical and animal experiments were discussed.
4) The advantages of this method for determining the region of the murmur origin, its mechanisms and in clarifying the local blood movement within the heart and its importance as a diagnostic tool were discussed.
