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因周围血管阻力急骤降低。导致急起而短暂的广泛性脑缺血,临床表现为一过性意识丧失,称为血管抑制性晕厥,又称单纯性晕厥、血管迷走反射性晕厥或Gower氏综合征。发病机理:人脑平均重量仅占体重的2％,而肺对血液需求量却占心排血量的1/6,脑耗氧量占全身耗氧量的20％。但是,脑组织储备能量物质(氧、葡萄糖)的能力差,故脑不仅需要在稳定而丰富的血液供应中摄取其代谢所必须的物质,而且对脑供血不足的耐受性亦差,仅短暂的脑缺血即可引起脑代谢失常及脑功能障碍。
Due to the sudden drop in peripheral vascular resistance. Leading to acute and transient extensive cerebral ischemia, clinical manifestations of transient loss of consciousness, known as vasospasm, also known as simple syncope, vasovagal syncope or Gower’s syndrome. Pathogenesis: the average weight of the human brain accounts for only 2% of body weight, while the lungs of the blood demand but accounted for cardiac output of 1/6, brain oxygen consumption accounted for 20% of systemic oxygen consumption. However, the ability of brain tissue to store energy substances (oxygen and glucose) is poor. Therefore, the brain not only needs substances necessary for its metabolism in a stable and abundant blood supply, but also has poor tolerance to cerebral hypoperfusion, The cerebral ischemia can cause brain metabolic disorders and brain dysfunction.