首页> 外文期刊>American Journal of Physiology >Effects of erythrocyte aggregation and venous network geometry on red blood cell axial migration.
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Effects of erythrocyte aggregation and venous network geometry on red blood cell axial migration.

机译:红细胞聚集和静脉网络几何形状对红细胞轴向迁移的影响。

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摘要

Axial migration of red blood cells in small glass tubes can cause blood viscosity to be effectively independent of shear rate. However, this phase separation may not occur to the same degree in the venous network due to infusion of cells and aggregates at branch points. To investigate this hypothesis, we followed trajectories of fluorescently labeled red blood cells in the venular network of the rat spinotrapezius muscle at normal and reduced flow with and without red blood cell aggregation. Cells traveling near the wall of an unbranched venular segment migrated approximately 1% of the longitudinal path length without aggregation and migrated slightly more with aggregation. Venular segment length between branch points averaged three to five times the diameter. Cells in the main vessel were shifted centrally by up to 20% of diameter at branch points, reducing the migration rate of cells near the opposite wall to <1% even in the presence of aggregation. We conclude that formation of a cell-free marginal layer in the venular network is attenuated due to the time dependence of axial migration and the frequent branching of the network.
机译:小玻璃管中红细胞的轴向迁移可导致血液粘度有效地独立于剪切速率。但是,由于在分支点注入了细胞和聚集体,因此在静脉网络中可能不会以相同的程度发生相分离。为了研究这个假设,我们追踪了正常和减少血流(有或没有红细胞聚集)的大鼠棘斜方肌的静脉网络中荧光标记的红细胞的轨迹。在未分支的静脉段壁附近行进的细胞在无聚集的情况下迁移了大约1%的纵向路径长度,在聚集时迁移了一些。分支点之间的静脉段长度平均为直径的三到五倍。主血管中的细胞在分支点处中心移至直径的最大20%,即使存在聚集,也将相对壁附近的细胞迁移率降低至<1%。我们得出结论,由于轴向迁移的时间依赖性和网络的频繁分支,静脉网络中无细胞边缘层的形成被减弱。

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