Etiologies of respiratory distress are numerous and include pneumonia, acute respiratory distress syndrome, pulmonary embolism, and exacerbations of chronic obstructive lung disease.

Objective the incidence of acute pulmonary embolism as a result of increasing year by year, the mortality rate high, fast and accurate early diagnosis is important.

Objective: To explore the applied value of emergency bedside echocardiography in early diagnosis of acute pulmonary embolism.