咯血为呼吸系统疾病常见急症之一,是指喉以下呼吸道或肺组织出血,经口腔咳出。咯血患者少则痰中带血丝,多则大口涌出,甚至窒息危及生命。其病因多种多样,急性大咯血的发生率达7%～32%[1],其重要性在于大咯血可致大气道阻塞和肺淹溺而突发窒息死亡,大量快速咯血可引起休克。咯血 Hemoptysis is one of the common emergency of respiratory diseases, which refers to the following throat respiratory tract or lung tissue bleeding, the buccal cavity cough. Patients with hemoptysis, as little as the bloody sputum, while the large gush, and even suffocating life-threatening. Its causes are varied, the incidence of acute massive hemoptysis up to 7% to 32% [1], its importance is that massive hemoptysis can cause airway obstruction and lung drowning and sudden suffocation of death, a large number of rapid hemoptysis can cause shock. Hemoptysis