肺血栓栓塞症(肺栓塞)是指脱落的血栓栓子随血流运行进入肺动脉及其分支,阻断肺循环所引起的一种临床病理状态。急性大面积肺栓塞的影像学分型是指栓塞部位≥2个肺叶或≥7个肺段,因血栓栓塞于肺动脉主干及其分支,短时间内肺部大血管阻塞,导致心输出量明显下降。有基础疾病、生理功能尤其是心肺功能日渐减退的老年人发生肺栓塞时,极有可能出现休克、晕厥,甚至突发心脏骤停死亡,该病起病急骤、危重,病情进展恶化迅速,又因临床表现无 Pulmonary thromboembolism (PE) refers to the shedding of thrombus emboli with the blood flow into the pulmonary artery and its branches, blocking the pulmonary circulation caused by a clinical and pathological state. Radiographic imaging of acute massive pulmonary embolism refers to the embolization site ≥ 2 lung lobes or ≥ 7 pulmonary segments, due to thromboembolism in the pulmonary artery trunk and its branches, short pulmonary large blood vessels obstruction, resulting in decreased cardiac output. In cases of underlying diseases and physiological functions, especially in the elderly with diminished cardiopulmonary function, shock, fainting and sudden cardiac arrest are most likely to occur. The disease is rapidly and critically ill and the disease progresses rapidly. No clinical manifestations