Consecutive patients with symptomatic PE, since no more than four days, confirmed by objective testing (high probability lung scan or intermediate probability lung scan and objectively confirmed deep vein thrombosis or spiral CT or pulmonary angiography or TE echocardiography) will undergo echocardiographic examination within 24 hour from diagnosis. Patients with RVD and normal BP (Systolic BP> 100 mmHg) will be included in the study.