Abstract：Objective: To determine the predictors of risk stratification in non-high risk pulmonary embolism(PE) patients caused by lower extremity deep venous thrombosis(DVT). Methods: Clinical data of total 85 non-high risk PE patients caused by DVT were retrospectively analyzed. CT obstruction index(CTOI) and right-to-left ventricular diameter ratio(RV/LV) were calculated with pulmonary arterial CT angiography(CTA) images. Logistic regression models were used to identify predictors of PE risk stratification. Results: The mean CTOI was 22.9%±15.7%, and the mean RV/LV was 1.0±0.2. Forty-four(51.8%) patients had low risk PE and 41(48.2%) patients had median risk PE. Logistic regression analysis showed that PE symptoms and CTOI were predictors of PE risk stratification(OR: 0.149; P=0.436; P=0.012, 0.000; 95% CI: 1.673～59.913, 1.101～1.274), and RV/LV(OR 0.149, P=0.436, 95% CI: 0.001～17.913), age(OR 1.028, P=0.344, 95% CI: 0.971～1.089), sex(OR 2.976, P=0.231, 95% CI: 0.500～17.727), type of DVT(OR 0.576, P=0.468, 95% CI: 0.130～2.555) or laterality of DVT(OR 0.499, P=0.199, 95% CI: 0.173～1.440) were not predictors. Conclusion: In non-high risk PE patients caused by DVT, PE symptoms and higher CTOI value are major predictors of higher PE risk stratification.
2015, Vol. 26 
