Single-Detector Helical Computed Tomography as the Primary Diagnostic Test in Suspected Pulmonary Embolism: A Multicenter Clinical Management Study of 510 Patients

510 consecutive inpatients and outpatients with clinically suspected pulmonary embolism

Single-detector helical computed tomography (CT) of the pulmonary arteries within 24 hours of presentation, followed by compression ultrasonography if CT results were normal or inconclusive

Occurrence of venous thromboembolism (pulmonary embolism or deep venous thrombosis) or death during 3-month follow-uphard clinical