Frequency of Diagnostic Symptomatic Pulmonary Embolism's in Patients Hospitalized for Clinical Exacerbation of Chronic Obstructive Pulmonary Disease (COPD)

Inclusion Criteria: * Patients hospitalized for a COPD exacerbation * COPD previously diagnosed Exclusion Criteria: * Allergy to iodinated contrast * Creatinine clearance \< 30 mL / min * Patient hospitalized for exacerbation of COPD for more than 48 hours * Pneumothorax * Exams impossible to be performed * Pregnancy * Life expectancy \< 3 months * Patients already receiving anticoagulant therapy for another reason (mechanical valve, cardiac arrhythmia).