抄録
The phonocardiograms of Fallot's tetralogy, pure pulmonary stenosis, ASD, VSD were analysed concerning systolic murmur, particulary Q-M.S.M./Q-IIa, the ratio of the time interval, Q-M.S.M. (from Q to the peak of systolic murmur) to the time interval, Q-IIa, (the duration of systole), and splitting of 2nd heart sound in term of anatomico-physiological relationships. 1) In the tetralogy of Fallot, the 4 classification types of systolic murmur gave the useful informations for the evaluation of the stenotic type, either valvular, infundibular or both. 2) In pure pulmonary stenosis the right ventricular pressure was able to be estimated on the basis of Q-M.S.M./Q-IIa and IIa-IIp interval. 3) In ASD Q-M.S.M./Q-IIa was determined by the functional pressure gradient across the pulmonary valve 4) In VSD Q-M.S.M./Q-IIa (calculated from the systolic murmur recorded over the left 3rd intercostal space) roughly represented degree of pulmonary hypertention.
