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Volume flow estimation in the precapillary mesenteric microvasculature in vivo and the principle of constant pressure gradient

机译:体内毛细血管前肠系膜微血管的流量估算和恒压梯度原理

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Volume flow was estimated from axial erythrocyte velocity measurements in 30 mesenteric microvessels of 6 rabbits and was compared to Murray's law predictions. The diameters of capillaries and precapillary arterioles ranged between 5.6 and 12 μm. The significant pulsating flow component existing in these microvessels was taken into account by measuring instantaneous axial blood velocity throughout the course of a cardiac cycle and then averaging over the period. In addition, the effect of the velocity profile variation with diameter was taken into account, for the first time, by using a profile factor function. According to Murray's law, the relation between blood volume flow and diameter is governed by a 'cube' law. Curve fitting to volume flow and diameter data pairs for rabbits, showed a dependence of volume flow on diameter raised to the 4th power (with a correlation coefficient equal to 0.97). The above result supports the hypothesis that, in the precapillary part of microvasculature, the principle of constant longitudinal pressure gradient rather than the principle of minimum work may be valid.
机译:由6只兔子的30个肠系膜微血管中的轴向红血球速度测量值估计体积流量,并将其与Murray定律预测值进行比较。毛细血管和毛细血管前小动脉的直径在5.6和12μm之间。通过测量整个心动周期过程中的瞬时轴向血流速度,然后对该时间段求平均值,可以考虑到这些微血管中存在的重要脉动血流分量。此外,首次通过使用轮廓因子函数来考虑速度轮廓随直径变化的影响。根据默里定律,血流量和直径之间的关系由“立方体”定律控制。兔子的体积流量和直径数据对的曲线拟合显示,体积流量对直径的依赖性提高到四次方(相关系数等于0.97)。以上结果支持以下假设:在微脉管系统的毛细血管前部分,恒定的纵向压力梯度原理而不是最小功原理可能是有效的。

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