晕厥是急诊的常见问题,在美国占急诊患者的3%,在高校急诊中晕厥较为多见。晕厥的发生是由于一过性的广泛脑供血不足,导致大脑皮质高度抑制而引起的短暂意识丧失。在相对较宽的灌注压力范围内,脑血管可通过自身调节,维持脑血流的稳定。当系统循环压力低于自身调节范围一定时间段,导致晕厥的发生。 Syncope is a common problem in emergency, accounting for 3% of emergency patients in the United States, syncope in college emergency is more common. Syncope occurs due to a transient lack of extensive cerebral blood supply, resulting in a high degree of inhibition of the cerebral cortex caused by the temporary loss of consciousness. Within a relatively wide perfusion pressure range, cerebral blood vessels can regulate itself to maintain the stability of cerebral blood flow. When the system cycle pressure is lower than its own regulation range for a certain period of time, resulting in the occurrence of syncope.