晕厥是一种突发性、短暂性、一过性的意识丧失和昏倒 ,是由于一时性广泛的脑供血不足使大脑突然陷入缺血、缺氧状态导致大脑皮质高度抑制所致 ,但各种反射仍然存在 ,数秒或数分钟后自行恢复[1] 。反射性晕厥又称神经介导性晕厥 ,临床上此型晕厥最常见 ,2 0 0 0年和 2 0 0 1年欧 Syncope is a sudden, transient, transient loss of consciousness and fainting due to sudden temporary brain ischemia into a temporary brain ischemia, hypoxia caused by a high degree of inhibition of the cerebral cortex, but a variety of Reflections still exist, recovering in seconds or minutes [1]. Reflex syncope, also known as nerve-mediated syncope, the most common clinical type of syncope, 2000 and 2001