液体聚积于肺血管外间隙时,即为肺水肿。当肺毛细血管压增高时,液体即从血管内渗入肺泡、气管和支气管,其中以左心衰为最常见的病因。肺水肿可分急性和慢性两种。急性肺水肿如果发现不及时,又未正确处理,则可致命。肺水肿的预防、评估和治疗的步骤如下: Liquid accumulation in the extravascular pulmonary space, the pulmonary edema. When the pulmonary capillary pressure increases, the fluid that is infiltrating into the alveoli, trachea and bronchi from the blood vessels, of which the most common cause of left heart failure. Pulmonary edema can be divided into two kinds of acute and chronic. Acute pulmonary edema may be fatal if it is found not timely and not properly treated. The steps for the prevention, assessment and treatment of pulmonary edema are as follows: