الفهرس 
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Abstract
Background : Pulmonary Embolism is a common and highly lethal entity that is often misdiagnosed. Despite the increased awareness of pulmonary embolism and improved diagnostic testing, there are still a significant number of patients not diagnosed until autopsy. Diagnosis of pulmonary embolism may be delayed and this delay may interrupt initiation of treatment and may lead to increased mortality. This delay can be prevented using the bedside echocardiography saving time needed to take decision so it can help in decreasing mortality. Aim of the study : This study is designed to determine the value of using the bedside transthoracic echocardiography by emergency physicians in the diagnosis of pulmonary embolism in clinically suspected patients. Subjects and Methods : This study was conducted on 50 patients attended at Emergency Hospital Mansoura University. All patients were subjected to clinical evaluation including history taking and examination. Investigations such as arterial blood gases complete blood count, ECG, Chest X ray (PA & lateral views), multi-detector computed tomography pulmonary angiography and bedside transthoracic echocardiography were done to all patients. Then Wells’ score was calculated for each patient and according to it, they were classified into two groups. Results and Conclusion : The calculated sensitivity and specificity of transthoracic echocardiography were 53.8 % and 90.9 % respectively with positive predictive value was 95.4 % and 35.7% for negative predictive value. The accuracy of Transthoracic echocardiography in relation to Computed Tomographic Pulmonary Angiography in diagnosis of pulmonary embolism was 62%. Right ventricular dilatation and right ventricular dysfunction identified in emergency room by ER physician using transthoracic echocardiography were found to be highly specific for pulmonary embolism but had poor sensitivity.