Abstract: In this study, the imaging parameters of MS-CTPA, including right ventricular diameter (RVD)/left ventricular diameter (LVD), main pulmonary artery (PA)/thoracic aorta (AO), ventricular septal displacement (VSB) and superior vena cava diameter (SVC) in the diagnosis and condition evaluation of acute pulmonary embolism (APE), were investigated in the diagnosis and severity evaluation of acute pulmonary embolism (APE). A total of 127 patients with suspected APE in our hospital were selected and divided into APE group (83 cases) and non APE group (44 cases) according to the results of clinical diagnosis. RVD/LVD, SVC, VSB and PA/AO in APE group were higher than those in non-APE group (P<0.05). ROC curve showed that the AUC of RVD/LVD, PA/AO, SVC and VSB in the diagnosis of APE were 0.844, 0.731, 0.764 and 0.746 respectively, and the AUC of combined diagnosis was 0.932, which was significantly higher than that of single index. RVD/LVD, SVC, PA/AO were positively correlated with paoi (P<0.05). Multiple linear regression analysis showed that RVD/LVD and SVC were significantly correlated with risk stratification after controlling other factors (P<0.05). MS-CTPA imaging parameters RVD/LVD, PA/AO, VSB and SVC are of great value in the diagnosis of APE. RVD/LVD and SVC are significantly correlated with the risk stratification of APE, which can provide guidance for precision medicine.

Key words: multislice spiral CT pulmonary angiography, acute pulmonary embolism, diagnosis, condition evaluation