一、概述晕厥即昏厥,俗称“昏倒”,是一种短暂的、突然发生的意识丧失状态,多由于大脑一过性广泛的缺血缺氧所引起,少数亦可因血液化学成分改变(如过度换气)或低血糖所致。由心脏病引起的晕厥称为心源性晕厥。发生晕厥的主要原因有:在各种病变因素的影响下,心输出量显著减少或心脏停搏, First, an overview Syncope that fainting, commonly known as “fainting,” is a transient, sudden loss of consciousness, mostly due to a transient brain ischemia caused by a wide range of hypoxia, a few can also be due to changes in blood chemistry (eg Hyperventilation) or hypoglycemia. Syncope caused by heart disease is called cardiogenic syncope. The main causes of syncope are: a variety of lesions under the influence of a significant reduction in cardiac output or cardiac arrest,