晕厥是指因可逆性脑功能障碍所致的暂时性意识丧失。脑功能障碍多系脑血流不足引起的脑缺氧所致,也可因脑代谢所需的基质浓度不足(如低血糖)所造成。引超晕厥的原因主要分血管性、心源性、脑源性及代谢性四类。临床最常见者为血管抑制性晕厥,其次为心源性晕厥。从临床意义来说,心源性晕厥最为重要,能否正确地处理心源性晕厥关系着患者的生命。心源性晕厥还可 Syncope refers to the temporary loss of consciousness due to reversible brain dysfunction. Cerebral dysfunction due to cerebral ischemia caused by cerebral hypoxia, but also due to brain metabolism required by the lack of matrix concentration (such as hypoglycemia) caused. The main reason cited ultra syncope sub-vascular, cardiac, brain-derived and metabolic four categories. The most common clinical vascular suppression of syncope, followed by cardiogenic syncope. From a clinical point of view, cardiogenic syncope is the most important, can correctly handle the cardiogenic syncope related to the patient’s life. Cardiac syncope can be