Smith D, Ishimitsu T, Craige E
J Am Coll Cardiol. 1984 Sep;4(3):517-21. doi: 10.1016/s0735-1097(84)80095-9.
Systolic-diastolic phasic alteration of left ventricular mechanical vibration transmissibility was studied in an open chest canine preparation. A continuous vibratory tone was applied to the base of the heart, and a miniature heart surface vibration sensor applied to the epicardium near the ventricular apex. This allowed the detection of the percent of the vibration that was transmitted from source to sensor. These data were compared with those from intracardiac phonocardiograms obtained using a micromanometer-tipped catheter. It was found that in systole, the ventricle transmitted a vibratory tone from the cardiac base to the apex so that it was readily detected by the heart surface sensor. In marked contrast, during diastole the relaxed ventricle failed almost completely to transmit the vibration to the apical position. When the dog experienced heart failure during hypoxia, the ventricular diastolic vibration transmissibility was found to equal or exceed that of the systolic phase.
在开胸犬实验模型中研究了左心室机械振动传递率的收缩期-舒张期相位变化。向心脏基部施加持续的振动音，在心室尖附近的心外膜上放置一个微型心脏表面振动传感器。这使得能够检测从声源传递到传感器的振动百分比。将这些数据与使用微压计尖端导管获得的心内心音图数据进行比较。结果发现，在收缩期，心室将振动音从心脏基部传递到心尖，因此心脏表面传感器很容易检测到。与之形成鲜明对比的是，在舒张期，松弛的心室几乎完全无法将振动传递到心尖位置。当狗在缺氧期间发生心力衰竭时，发现心室舒张期振动传递率等于或超过收缩期。
