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心动周期中肢体节段脏搏容积(PV)是指肢体节段容积的最大改变值。心动周期中最大净流入量(PNI)即是dv/dt的最大值。这些参数值很小(PV约为0.0003×V),故难以测定。因此PV和PNI的常规模拟容积脉搏图测定不太精确,且难以重复。本文描述一种应用选择性信号平均的数字增强法以改善PV和PNI的可重复性。作者描记了8例健康成年男性(年龄26±4岁)的右小腿容积脉搏图,30分钟后重复测定。数字增强法可使PV值从19.9±4.5％减至5.4±2.1％(P<0.01)。重复测
Limb segmental soak volume (PV) during a cardiac cycle refers to the maximum change in limb segment volume. The maximum net inflow (PNI) during the cardiac cycle is the maximum dv / dt. The value of these parameters is small (PV is about 0.0003 × V), so it is difficult to measure. Therefore, conventional simulated volumetric plethysmography measurements of PV and PNI are less accurate and difficult to duplicate. This article describes a digital enhancement method that uses selective signal averaging to improve the repeatability of PV and PNI. The authors delineated the right calf volume pulse pattern of 8 healthy adult men (age 26 ± 4 years), who repeated the test 30 minutes later. The digital enhancement method reduced the PV value from 19.9 ± 4.5% to 5.4 ± 2.1% (P <0.01). Repeat test