晕厥是由于一过性脑供血不足所致的短暂的意识丧失状态,发作时患儿因肌张力消失、不能维持正常姿势而倒地,一般能够很快恢复正常。晕厥是儿童的常见病症,可由许多原因引起。据一项美国的流行病学调查[1]发现,晕厥的发生率呈上升趋势。50年代儿童晕厥发生率为71·9/10万,到80年 Syncope is due to transient cerebral insufficiency due to short-term state of consciousness loss, onset of the child due to muscle tension disappeared, can not maintain normal posture and fell to the ground, the general can quickly return to normal. Syncope is a common childhood condition that can be caused by many causes. According to a United States epidemiological survey [1] found that the incidence of syncope is on the rise. In the 1950s, the incidence of syncope in children was 71.9 / 100,000, up to 80 years