晕厥,俗称昏倒,系一种暂时性脑缺血、脑缺氧所致的急性短暂的意识丧失。引起晕厥的原因甚多,诸如血管运动功能失调,心功能不全所引起的暂时性脑缺血,以及各种原因引起的脑代谢障碍等,根据病因大体可分为如下几类: 一、血管神经性晕厥。此为最常见的晕厥,由于各种原因引起反射性的外周小血管突然扩张,外周阻力降低,当心输出量不能 Syncope, commonly known as collapsed, is a temporary transient loss of consciousness due to transient cerebral ischemia and cerebral hypoxia. Cause syncope for many reasons, such as vascular motor dysfunction, heart failure caused by temporary cerebral ischemia, and various causes of cerebral metabolic disorders, according to the cause can be broadly divided into the following categories: First, the vascular nerves Sexual fainting. This is the most common syncope, due to various reasons caused by a sudden peripheral small blood vessels dilated reflex, peripheral resistance decreased, be careful that the output can not