急性肺栓塞(pulmonary embolism,PE)是指内源性或外源性栓子栓塞肺动脉系统血管,引起肺循环功能障碍的临床病理综合征,主要由下肢深静脉和盆腔静脉血栓脱落进入肺循环引起,起病凶险,致死率高。由于其临床表现缺乏特异性,因而临床诊断困难。近年来,由于影像诊断技术的日新月异及 Acute pulmonary embolism (PE) refers to the clinicopathologic syndrome of embolism of the pulmonary artery system caused by endogenous or exogenous emboli, causing pulmonary circulation dysfunction. It is mainly caused by the fall of deep vein and pelvic venous thrombus into the pulmonary circulation, Ill-dangerous, high fatality rate. Due to the lack of specificity of its clinical manifestations, clinical diagnosis is difficult. In recent years, due to the ever-changing image diagnostic technology