Epidemiology of Thromboembolism Disease: A Cohort Study

The purpose of this study is to determine different risk factors of thromboembolic disease. Different points will be studied 1. do different types of thromboembolic disease (distal Deep Vein Thrombosis (DVT), proximal DVT, Pulmonary Embolism (PE) and DVT, PE without DVT) have the same clinical significance (risk factors and prognosis) ? 2. Is it necessary to obtain a detailed history of thromboembolic disease ? 3. Do older patients have particular risk factors ? 4. Do preventive treatments modify the level of risk factors and the clinical signs of thromboembolic disease ? 5. Do predictive clinical scores have the same performance for both in and outpatients ? 6. Can patients with a potential high level of thromboembolic risk (surgery, pregnancy) but no clinical thromboembolic symptoms, develop a low risk ? 7. The evolution of the disease in patients with negative or positive Venous ThromboEmbolism (VTE) exploratory tests.