小児心雑音におけるQ-Mm時間並びに収縮期雑音持続時間率の心音図学的検討
1972 年 32 巻 12 号 p. 744-759
詳細
1972 年 32 巻 12 号 p. 744-759
Phonocardiographic studies were made on the Q-Mm interval, that is the time from Q-wave in E.C.G. to beginning of murmur, and the duration of the systolic murmur (DSM) caused by venous etiology.
In this studies, following 6 groups with systolic murmur have been carried out. (30 normal subjects, 20 children with anemia, 30 with rheumatic carditis, 30 with ASD., 20 with PDA., 30 with VSD., )
Results were as follows :
1) The Q-Mm interval in group with the normal systolic murmur was found to be longest among different 6 groups, ranging from 0.11 to 0.16 sec. with a mean of 0.130 sec.
The ratio of DSM to I-IIa (total length of systole) was found to be 24.0-62.5% with a mean of 42% and this is the shortest value as compared with that of the other groups.
Both the Q-Mm interval and the I-IIa interval were prolonged with increasing age.
2) In group with anemic murmur, the Q-Mm interval varied from 0.11 to 0.15 sec. with a mean of 0.128 sec. and the ratio of DSM to I-IIa ranged from 33.3-66.8% with a mean of 47.5%.
3) In group of rheumatic carditis, the Q-Mm interval varied from just 0.10 to 0.16 sec. with a mean of 0.125 sec. and the ratio of DSM to I-IIa ranged from 33.3-74.2% with a mean of 50.3%.
4) In ASD, the Q-Mm interval varied from 0.10 to 0.18 sec. with a mean of 0.116 sec. and the ratio of DSM to I-IIa ranged from 41.5-84.6% with a mean of 71.5%.
5) In PDA, the Q-Mm interval varied from 0.10 to 0.14 sec. with a mean of 0.12 sec. and the ratio of DSM to I-IIa ranged from 70.0-85.2% with a mean of 75.6%.
6) In VSD, the Q-Mm interval were less than 0.10 sec., with only one exception, with a mean of 0.089 sec. and the average of the ratio of DSM to I-IIa was 84.8%. It was the greatest value in comparison with that of the other groups.
7) In congenital heart diseases groups and the other 3 groups, there seems to be obvious that the longer DSM, the shorter the Q-Mm interval.
The Q-Mm interval was longer in the latter than that of the former but DSM was shorter in the latter than that of the former.
