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作者对12050例黑人学校儿童进行了心脏听诊检查,对无害杂音与生理性第三心音分析如下: 12050例儿童年龄为2～18岁。心脏正异者11754例(占97.5％),风心病80例(占6.9‰),二尖瓣脱垂168例(占13.4‰),先心病48例(占3.9‰)。心脏正常的儿童中96％有第三心音,72％有无害性收缩期杂音,0.27％有无害性舒张中期杂音。
The author of 12050 cases of black school children were auscultation examination of the harmless noise and physiological third heart sound analysis is as follows: 12050 cases of children aged 2 to 18 years old. 11,754 (97.5%) had heart abnormalities, 80 (69%) had rheumatic heart disease, 168 (13.4%) had mitral valve prolapse, and 48 (3.8%) had congenital heart disease. 96% of children with normal heart have third heart sound, 72% have noisy systolic murmur, 0.27% have no harmful diastolic murmur.