Hirschfeld S, Liebman J, Borkat G, Bormuth C
Circulation. 1977 Apr;55(4):602-4. doi: 10.1161/01.cir.55.4.602.
Echographic aortic valve closure was compared to the dicrotic notch of the aortic pressure and intracardiac A2 to define the exact temporal relationship of the echographic, pressure, and sound parameters of aortic valve closure. Sixteen children, ages 3--20 years, were evaluated by simultaneous aortic valve echograms, micromanometric aortic root pressure tracings, and intracardiac phonocardiograms recorded at paper speeds of 200 mm/sec. Our observations demonstrated that echographic coaptation of the aortic valve leaflets coincides with the trough of the aortic pressure incisura and the onset of A2. The data suggest that A2 is a result of valve closure.
将超声心动图上的主动脉瓣关闭与主动脉压力的重搏波切迹以及心内A2进行比较，以确定主动脉瓣关闭的超声心动图、压力和声音参数的确切时间关系。对16名年龄在3至20岁的儿童进行了评估，同时记录了主动脉瓣超声心动图、主动脉根部微测压压力曲线以及以200毫米/秒的纸速记录的心内心音图。我们的观察结果表明，主动脉瓣叶的超声心动图贴合与主动脉压力切迹的最低点和A2的起始点相吻合。数据表明，A2是瓣膜关闭的结果。
