Abstract
1)Intracardiac phonocardiographic recordings were taken from 25 cases of congenital heart disease group. The murmurs of these clinical cases together with results of animal experiments were analysed and studied.
2)In pulmonary stenosis the typical ejection sound and the late P2 was recorded only within the pulmonary artery by intracardiac phonocardiography. With this method the mechanism of the rise of this murmur in the stenosed region was clarified. In animals with experimental pulmonary stenosis the systolic murmur and the splitting of the second sound was found, to be more closely correlated to flow volume rather than the hight ventricular pressure.
3)In atrial septal defects the systolic murmurs heard in the basal region was found to be chiefly due to the relative pulmonary stenosis. The effect of the shunt murmur components was found to be minimal.
4)Ventricular septal defects : In dogs experimental ventricular septal defects were made and within the right ventricle shunt murmurs were recorded. Lesions believed to be due to jet stream were also seen.
Our results showed that systolic murmurs of V.S.D. vary according to the size of the defect, pathological types, etc, but both shunt murmurs and relative pulmonary stenosis was present.
A mid-diastolic murmurs were also recorded from the right ventricle and an experimental study of the mechanism of murmur was carrried out.
5)Patent ductus arteriosus, the rupture of the aneurysm of the sinus Valsalva, presented continuous murmurs in the shnut regions.
6)Intracardiac phonocardiography was found to be an important method for the diagnosis of congenital heart diseases and for clucidation of the intracardiac hoemodynamics.
