小児II音分裂の心音図学的研究

小沢 正博

doi:10.14930/jsma1939.28.7

Phonocardiographic studies were performed to study the incidence of respiratory splitting of the second heart sound in 150 cases of healthy children, aged one month to 14 years. Furthermore, fifty patients with atrial septal defect (ASD), ventricular septal defect (VSD), rheumatic carditis and acute glomerulonephritis were examined. Results were as follows : 1. The incidence of physiological splitting of the second heart sound was found to be high as 80 % (120 cases) of healthy children during the period of inspiration, ranging 0.015 to 0.055 sec. of interval time with a mean of 0.031±0.007 (Standard Deviation) sec. The incidence of splitting phenomena and variation of mean interval were increased as age increased 2. The splitting disappeared in 54 % of above 120 cases during the expiration, and the incidence of disappearance was decreased as age increased. The interval time of splitting during the expiration varied from 0 to 0.035 sec. with the mean of 0.008 sec. 3. The difference of interval time of splitting on inspiration and expiration showed from 0.015 to 0.03 sec. in majority cases of healthy subjects with a mean of 0.024 sec. 4. Seventy percent of patients with ASD showed fixed splitting. 5. Respiratory splitting was observed in 53 % of cases with VSD. However, no fixed splitting was observed in these cases. 6. Pathological splitting including abnormal splitting by the respiration (should have splitting interval of over 0.035 sec. during expiration) and fixed splitting was observed in 40 % of rheumatic carditis on the initial examination which decreased to 20 % after 2 months of treatment. 7. No difference was observed in the results obtained from the subjects of acute glomerulonephritis as compared with those of healthy children.

小児II音分裂の心音図学的研究

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小児II音分裂の心音図学的研究

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収録刊行物

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