Penáz J
Department of Physiology, Medical Faculty, Masaryk University, Brno, Czechoslovakia.
Physiol Res. 1992;41(1):5-10.
When blood pressure is measured in the finger using the volume clamp method the value at which the vascular volume is clamped is of crucial importance. Since the discovery of the method, several criteria of finding a correct set point have been elaborated: 1. The volume oscillations reach their maximum amplitude at cuff pressure equalling mean blood pressure. 2. The form of the diastolic portion of volume pulsations changes if the cuff pressure moves around the mean blood pressure. 3. The set point can be positioned at one third of the arterial volume. 4. The dynamic vascular compliance (DVC) may be continuously measured as the instantaneous amplitude of vascular volume oscillations is elicited by a relatively small and rapid vibration of the cuff pressure. The shape of the DVC pulse characteristically depends on the transmural pressure (TP): at negative TP (cuff pressure exceeding the blood pressure) it shows a distinct positive systolic peak, at positive TP the polarity of the DVC pulse is reversed. In contrast to the first three ways to find the set point, the last one may operate even in closed-loop performance, i.e. during the blood pressure measurement.
当使用容积钳夹法在手指上测量血压时，钳夹血管容积的数值至关重要。自该方法被发现以来，已经阐述了几种找到正确设定点的标准：1. 在袖带压力等于平均血压时，容积振荡达到最大幅度。2. 如果袖带压力在平均血压附近变动，容积搏动舒张期部分的形态会改变。3. 设定点可位于动脉容积的三分之一处。4. 动态血管顺应性（DVC）可通过袖带压力相对较小且快速的振动引发血管容积振荡的瞬时幅度来连续测量。DVC脉搏的形态典型地取决于跨壁压力（TP）：在负TP（袖带压力超过血压）时，它显示出明显的正收缩峰，在正TP时，DVC脉搏的极性反转。与前三种找到设定点的方法不同，最后一种方法甚至可以在闭环操作中运行，即在血压测量期间。
