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在临床工作中,经常会碰到一些“暂时性脑缺血”患者。这些病人大多是中老年人,有的已多次发病,发作多与突然转动头颈有关系。为什么转动头颈会发生暂时性脑缺血呢? 要弄清原因,需先了解脑的供血情况。人到了中年以后,动脉血管会逐渐老化,弹力下降,血管的内膜粗糙。然而,脑组织的神经细胞对缺氧十分敏感。大脑的氧气是由血液输送的。当脑供血量减少到40％时,脑血液循环就会出现障碍。
In clinical work, often encounter some “temporary cerebral ischemia” patients. Most of these patients are middle-aged and elderly people, some of whom have had multiple episodes. Their attacks are mostly related to sudden head and neck rotation. Why temporary brain ischemia occurs when turning the head and neck? To find out why, you need to understand the brain blood supply. When people reach middle age, arterial blood vessels will gradually age, elasticity decreases, and the blood vessel’s inner membrane becomes rough. However, brain tissue nerve cells are very sensitive to hypoxia. The brain’s oxygen is delivered by the blood. When the amount of brain blood supply is reduced to 40%, there is an obstacle to cerebral blood circulation.