NPPB and pulmonary arterial hypertension: Submassive pulmonary emboli are characterized by hemodynamically stable PE accompanied by pulmonary hypertension on echocardiography, RV cavity expansion, interventricular septal deviation, or a right-to-left ventricular ratio equal to or greater than 0.9 on CT angiography, with or without elevated troponin and BNP levels [2].