呼吸衰竭(简称呼衰)是指由于呼吸功能严重障碍,在海平面上,于休息状态呼吸空气时动脉血氧分压(PaO_2)<60毫米汞柱,和/或二氧化碳分压(PaCO_2)>50毫米汞柱,而引起一系列的生理和代谢功能紊乱的临床综合征。呼衰有急、慢性之分。急性呼衰指原来肺功能正常,因突然发生的原因如电击、创伤、溺水、药物中毒或各种理化因素使肺功能于短时间内出现严重障碍;慢性呼衰是指原有慢性呼 Respiratory failure (referred to as respiratory failure) is due to severe respiratory dysfunction, arterial partial pressure of oxygen (PaO_2) <60 mmHg, and / or PaCO_2> at sea level when breathing air at rest 50 mmHg, which caused a series of physiological and metabolic disorders clinical syndrome. Calling for an emergency, chronic points. Acute respiratory failure refers to the original normal lung function, due to sudden causes such as electric shock, trauma, drowning, drug poisoning or a variety of physical and chemical factors in lung function in a short time serious obstacles; chronic respiratory failure refers to the original chronic call