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中枢神经系统的功能状态有赖于主要物质的充分供应.脑血流必须保持高于某临界水平,才能供应足够量的氧及葡萄糖.然而,当灌注低于某一水平,脑功能就会发生障碍,此称神经功能障碍的血流阈值;这时,若脑血流增加至这一水平之上,脑功能就能恢复正常,但若脑血流进一步降低至临界水平之下并维持一定时期,则可导致不可逆的脑功能障碍,组织结构的完整性亦开始遭到破坏,此称膜衰竭的血流阈值;二者之间的区域称
The functional status of the central nervous system depends on a sufficient supply of the main substance, and cerebral blood flow must be kept above a critical level to supply enough oxygen and glucose, however, when perfusion falls below a certain level, there is an obstacle to brain function , This is called the blood flow threshold of neurological dysfunction; at this moment, if the cerebral blood flow increases to above this level, the brain function will be able to return to normal, but if the cerebral blood flow further reduces below the critical level and maintains for a certain period of time, Can lead to irreversible brain dysfunction, the integrity of the organizational structure has also begun to be destroyed, this is called the blood flow threshold of membrane failure; the area between the two said