Pulmonary embolism is a pathological process in which a blood clot in the vessels detaches, affecting the pulmonary artery and its branches. After the occurrence of a pulmonary embolism, patients generally visit the respiratory medicine department. Clinically, a pulmonary artery CTA can be performed to further confirm the diagnosis. The treatment methods in clinical practice are mainly as follows: If the patient experiences circulatory disturbances, emergency thrombolytic therapy may be considered; if the patient's circulation is stable, treatment with low molecular weight heparin and warfarin anticoagulation can be considered. Of course, it is important to monitor the patient's respiration and blood pressure.