Background: The evaluation of right ventricular (RV) dysfunction by echocardiography is one of the most important established determinants of the prognosis RV (r = 0.469; p = 0.002). Diameter of right descending pulmonary artery on chest X-rays was also found as a signifi cant predictor of RV dysfunction besides the troponin-T levels and systolic pulmonary arterial pressure (p < 0.05). Conclusions: Diameter of right descending pulmonary artery on chest X-rays may provide information about the risk for pulmonary embolism patients and may be used as a prognostic radiological parameter for the appropriate management of acute pulmonary embolism. (Cardiol J 2013; 20, 2: 184-189)