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妊娠分娩时脑血管障碍的发生率增加,因不能选用有侵袭的脑循环测定法,研究是困难的。 非孕时脑循环调节机制包括:①化学调节机制:脑血管吸入CO_2扩张,给氧则收缩。脑功能亢进时脑代谢旺盛,脑O_2消耗和CO_2产生增多,脑组织PO_2↓和PCO_2↑,脑血管扩张,脑血流↑,脑组织PCO_2↓和PO_2↑,脑血流也恢复原状。脑功能抑制时则其过
The incidence of cerebrovascular disorders increases during pregnancy and delivery, and research is difficult because of the inability to use invasive cerebral circulation assays. Non-pregnancy cerebral circulation regulation mechanisms include: ① chemical regulatory mechanism: cerebral vascular inhalation of CO_2 expansion, oxygen contraction. Brain metabolism hyperthyroidism exuberant metabolism, brain O 2 consumption and increased CO 2 production, brain tissue PO 2 ↓ and PCO 2 ↑, cerebrovascular expansion, cerebral blood flow ↑, brain tissue PCO 2 ↓ and PO 2 ↑, cerebral blood flow also returned to its original state. When the brain function is suppressed