YM150 for Prevention of Venous Thromboembolism in Patients With Acute Medical Illness

Inclusion Criteria: * Patient is hospitalized within 2 days before the study and has more than 1 basic VTE risks * Complete bed rest is required in the fist day of hospitalization and at least 4 days hospitalization * Written informed consent obtained Exclusion Criteria: * Subject has history of deep vein thrombosis and/or pulmonary embolism * Subject has a hemorrhagic disorder and/or coagulation disorder * Subject has had clinically important bleeding occurred within 90 days prior to obtaining informed consent * Subject has an acute bacterial endocarditis * Subject has uncontrolled severe or moderate hypertension, retinopathy, myocardial infarction or stroke * Subject is receiving anticoagulants/antiplatelet agents * Subject has a body weight less than 40 kg * Major trauma, major surgery, eye, spinal cord and/or brain surgery within 90 days prior to obtaining informed consent, or the subject scheduled for these surgeries during the study periods