肥厚型心肌病人,肥厚的心肌可使心室流出道受阻。如梗阻发生于流出道则在肺动脉瓣区可听到收缩中晚期喷射型杂音。遇此情况,须与心室间隔缺损进行鉴别。杂音部位相近,均属收缩期,但室缺的典型杂音系响亮而粗糙的收缩期吹风样返流型杂音,响度可达4～5级,但多为全收缩期。若于手术前行心导管检查和心室造影可以最后鉴别。导 Hypertrophic cardiomyopathy, hypertrophic myocardium can block the ventricular outflow tract. Such as obstruction occurred in the outflow tract in the pulmonary valve area can be heard in the late contraction of jet noise. In such cases, ventricular septal defect should be identified. Similar parts of murmur, are systolic, but the typical room murmur is a loud and rough systolic hair-like reflux murmur, loudness up to 4 to 5, but mostly full systolic. If the preoperative catheterization and ventricular catheterization can be the last to identify. guide