Historical Perspective of Venous Thromboembolism;Coagulation for the Intensivist;VTE Prophylaxis in the Critically Ill;Risk Stratification of Pulmonary Embolism; Treatment of Pulmonary Embolism: AntiCoagulation; Thrombolytic Therapy and Complications; Major Pulmonary Embolism;Catheter and Surgical Thromboembolectomy;Vena Caval Interruption;New Anti-Coagulants;Heparin Induced Thrombocytopenia