儿童气管误入异物、成年人大咯血均易导致窒息。而人体大脑对缺氧的耐受时限为4～6分钟,超过时限,即使抢救成活,也只能处于“植物人”状态。因此,有效的院前急救是患者能否恢复脑、呼吸、循环等功能,健全生命活动的基础。因此,各基层单位的医务 Children tracheal intrusion of foreign body, adult hemoptysis are easily lead to suffocation. The tolerance of the human brain to hypoxia time limit of 4 to 6 minutes, more than the time limit, even if the rescue survived, can only be in the “vegetative state”. Therefore, the effective pre-hospital emergency is whether the patient can resume the functions of the brain, breathing, circulation and so on, so as to improve the basis of life activities. Therefore, the basic unit of medical treatment