肺水肿是由于肺血管内液体渗入肺间质组织或肺泡内，使肺血管外液体量增多的病理状态。临床上表现为急性起病，如呼吸困难、紫组、咳嗽、咳白色或粉红色泡沫样痰，两肺可闻及弥漫性湿性学音，胸部X线可见两肺蝶状或片状模糊阴影，是临床急症之一。临床习惯上按解剖部位将肺水肿 Pulmonary edema is due to the pulmonary vascular infiltration of interstitial lung tissue or alveolar, so that extravascular fluid volume increased pulmonary pathology. Clinical manifestations of acute onset, such as dyspnea, purple group, cough, cough white or pink foam-like sputum, both lungs can be heard and diffuse wet sound of learning, chest X-ray can be seen two butterfly or sheet fuzzy shadow , Is one of the clinical emergency. According to the anatomy of clinical practice will pulmonary edema