晕厥是指因各种原因导致大脑血流量减少、意识丧失,历时短暂并可完全恢复的一种临床症状,常伴跌倒、外伤、残疾,偶有死亡的报道。老年人器官组织退化,生理功能下降,心排血量和脑血流量减少,与此同时由于脑动脉硬化等原因,脑血管阻力增高,均可导致晕厥发生。有研究显示,大约30%的成年人一生 Syncope refers to a variety of reasons leading to decreased cerebral blood flow, loss of consciousness, lasted a short time and can be completely recovered from a clinical symptom, often accompanied by falls, trauma, disability and occasional death reports. Degradation of organ tissue in the elderly, decreased physiological function, cardiac output and cerebral blood flow decreased, at the same time due to cerebral arteriosclerosis and other reasons, increased cerebral vascular resistance, can lead to syncope. Studies have shown that about 30% of adults have a lifetime