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血液流变学异常已被认为是发生脑梗塞的原因之一,红细胞压积升高。血液粘度上升以及红细胞变形能力减弱,不仅成为脑梗塞的危险因素,而且可引起脑血流量的减少,对脑梗塞的症状、预后有着严重影响。最近有人否定对急性期脑梗塞行血液稀释疗法的疗效。现就血液流变学异常在脑梗塞发生上的作用作一探讨。一、脑循环与血液流变学1.对脑血流的影响作者一般依Poiseille法测脑血流量,其公式为V=πPr~4t/81η。脑血流量(V)与压力差(P),血管半径的四次方(r~4)成正比;与血管
Hemorheology abnormalities have been considered as one of the causes of cerebral infarction, elevated hematocrit. Increased blood viscosity and decreased erythrocyte deformability not only become a risk factor for cerebral infarction, but also cause a decrease in cerebral blood flow, which has a serious impact on the symptoms and prognosis of cerebral infarction. Recently, some people deny the efficacy of hemodilution for acute cerebral infarction. Now on the abnormal blood rheology in the role of cerebral infarction for a discussion. First, the cerebral circulation and hemorheology 1. The impact on cerebral blood flow Author generally Poiseille method for measuring cerebral blood flow, the formula is V = πPr ~ 4t / 81η. Cerebral blood flow (V) is proportional to the pressure difference (P) and the fourth power of the vessel radius (r ~ 4)