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当旁人突然“碰！”的一声路倒在地，你上前去拍了他、呼喊他名字，却完全没有反应，脑里闪过千百万种不祥的念头，究竟是猝死、昏厥、还是昏迷？

急性意识丧失简单可以分成3种状况：

{1}猝死：心跳突然停止，全身循环停止，无呼吸、无脉搏。

{2}昏厥：有呼吸心跳，但脑部血流暂时失去灌流，几秒或几分钟后就会苏醒。

{3}昏迷：有呼吸心跳，但大脑醒觉功能因本身，或是其他原因受到抑制，呈现持续性的意识丧失。

眼见旁人倒地不醒，第一时间应收起慌张，大声求助寻求帮忙，赶快报案及招救护车，并拿自动体外电击器（AED）。

在猝死、昏厥、昏迷中，最危急的情况为猝死，就是病人的心脏突然停止跳动，或是呈现致死心律不整，也就是所谓的心室纤维颤动。

此时，会发现病患不呼吸、失去胸部起伏，颈动脉处也摸不到脉搏搏动，就必须开始操作人工心肺复苏术（CPR），等待AED到场后合并使用，并判断是否需要电击。

人工心肺复苏术 ：将病人翻到正面朝上、衣服掀开，朝两乳头连线中点双手并用，用手掌以每分钟至少100下的速度用力压胸。