PE severity grade
embolism, pulmonary artery branch embolism, pulmonary artery embolism
PULMONARY ARTERY EMBOLISM, EMBOLISM
The severity grade of PE was determined based on CTPA. PE was divided into 4 severity grade categories: 1) severe PE, which was defined as the pulmonary artery embolism or multiple pulmonary arteriole embolism; 2) moderate PE, defined as pulmonary artery branch embolism; 3) mild PE, defined as single pulmonary arteriole embolism; 4) no PE.