Vardan S, Warner R, Mookherjee S, Mead M, Obeid A I
Jpn Heart J. 1979 May;20(3):277-88. doi: 10.1536/ihj.20.277.
Simultaneous echo- and phonocardiographic studies were performed in 17 patients with normally functioning Lillehei-Kaster (LK) tilting disc prosthesis in the aortic position. The LK aortic valve prosthesis was well recorded by echocardiography with a disc excursion of 14 to 25 mm and very fast opening and closing velocities, too rapid for quantitative assessment. On phonocardiography the opening click of the prosthesis was only rarely observed (2 out of 17 cases), while the closing sound was consistently present in all patients, occurring within 5 msec of the point of complete closure of aortic disc prosthesis by echocardiography. Systolic time intervals (STI) measured by combined echo-and phonocardiography were similar to the predicted values in 15 patients who had no evidence of residual cardiac dysfunction. In the remaining 2 patients, one or more components of the STI differed by more than 2 standard deviations from the predicted values, and in these there were associated findings to explain the discrepancies. This study illustrates the echo- and phonocardiographic features of the normally functioning LK aortic valve prosthesis. In addition, precise measurements of the isometric contraction and relaxation periods as well as standard systolic time intervals are possible with these techniques.
对17例主动脉位置的Lillehei-Kaster（LK）倾斜碟瓣功能正常的患者进行了同步超声心动图和心音图研究。超声心动图能很好地记录LK主动脉瓣人工瓣膜，瓣叶活动幅度为14至25毫米，开闭速度非常快，快到无法进行定量评估。在心音图上，人工瓣膜的开瓣音很少能观察到（17例中有2例），而所有患者均持续出现关闭音，在超声心动图显示主动脉瓣人工瓣膜完全关闭点的5毫秒内出现。通过联合超声心动图和心音图测量的收缩期时间间期（STI），在15例无残余心脏功能障碍证据的患者中与预测值相似。在其余2例患者中，STI的一个或多个成分与预测值相差超过2个标准差，并且在这些患者中有相关发现来解释这些差异。本研究阐述了功能正常的LK主动脉瓣人工瓣膜的超声心动图和心音图特征。此外，采用这些技术可以精确测量等容收缩期和舒张期以及标准收缩期时间间期。
