Systolic pressure--diameter relations in the normal conscious dog.
Systolic pressure--diameter relations in the normal conscious dog.
复制标题
正常有意识的狗的收缩压与直径的关系。
作者：
Felix Mahler;J. Covell;John Ross
在正常、有意识的狗左心室收缩时，通过心内膜超声计和微压力计产生压力-直径环。在控制状态下，在体积和压力加载期间，以及在增强收缩性期间进行了研究。弹射结束时的内径与收缩压呈线性相关，弹射结束时的压力-内径关系不受预载荷变化的影响。然而，这种关系在很大程度上被肌力状态的变化所取代，这表明压力加载产生的瞬时压力-长度平面对于给定的收缩性水平是唯一的。
Pressure--diameter loops were generated in normal, conscious dogs during left ventricular contraction by means of endocardial ultrasonic gauges and micromanometers. Studies were made in the control state, during volume and pressure loading, and during enhancement of contractility. The diameter at the end of ejection was linearly related to systolic pressure, and the pressure--diameter relation at end-ejection was not affected by changes in preload. However, this relation was substantially displaced by changes in inotropic state, suggesting that the instantaneous pressure--length plane produced by pressure loading is unique to a given level of contractility.