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循环障碍所致意识丧失往往是由于脑供血不足,脑细胞缺氧性代谢紊乱所致。决定脑血流的主要因素是心排血量、脑血管的灌注压和阻力。休息状态时正常心排血量(CO)之15%供应脑组织。正常成人卧位每分钟脑血流量700～750毫升。脑组织缺乏储备可用能量底物的能力,其需氧量比肌肉多19倍,比心肌多4倍。脑组织对缺氧特别缺乏耐受力,因此维持正常
Loss of consciousness due to circulatory disorders is often due to lack of blood supply to the brain, disorders caused by hypoxic metabolism of brain cells. The main factors that determine cerebral blood flow are cardiac output, cerebral perfusion pressure and resistance. At rest, 15% of normal cardiac output (CO) was supplied to brain tissue. Normal adult cerebral blood flow per minute 700 ~ 750 ml. Brain tissue lacks the ability to store available energy substrates, which require 19 times more oxygen than muscles and 4 times more than myocardium. Brain tissue is particularly poorly tolerant of hypoxia and therefore remains normal