Wave speed (c) must be known to separate forward- and backward-going waves during wave-intensity analysis, which measures the energy transported by the waves in the circulation. c is related to elastance; the present study was performed to measure right ventricular (RV) c during the cardiac cycle and to compare c with RV elastance. In 7 dogs, we measured right atrial, pulmonary arterial, pericardial and 2 RV pressures, and pulmonary arterial flow. A pulse generator was connected to the RV apex, and c was measured by determining the transit time between the 2 high-fidelity RV pressure transducers; the distance was measured roentgenographically. Eight sonomicrometry crystals were implanted in the RV endocardium to calculate RV volume and, thereby, elastance. RV c ranged from approximately 1 m/s during diastole to approximately 4 m/s during systole. Log-log plots of c vs. elastance were linear. These slopes represent the power relationships between c and elastance and ranged from 0.30 to 0.56; for the combined data, it was 0.31. Given knowledge of c, forward- and backward-going waves can be identified and their energy quantitated. In the canine RV, c is approximately proportional to 1/3 the power of elastance: log c = 0.31.log E - 2.05.
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机译：在进行波强度分析时，必须知道波速（c）来分离前进和后退的波浪，以测量循环中波浪传输的能量。 c与弹性有关;本研究旨在测量心动周期中的右心室（RV）c并将其与RV弹性进行比较。在7只狗中，我们测量了右心房，肺动脉，心包和2 RV压力以及肺动脉流量。将一个脉冲发生器连接到RV顶点，并通过确定2个高保真RV压力传感器之间的通过时间来测量c。该距离是通过放射线照相法测量的。将八个体温测定法晶体植入RV心内膜，以计算RV体积，从而计算弹性。 RV c从舒张期的大约1 m / s到收缩期的大约4 m / s。 c与弹性的对数-对数图是线性的。这些斜率表示c与弹性之间的幂关系，范围为0.30至0.56;合并数据为0.31。有了c的知识，就可以确定前进和后退的波并对其能量进行量化。在犬RV中，c大约与弹性的幂成正比：log c = 0.31.log E-2.05。
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