Prophylaxis of venous thrombosis.
D000368:Aged; D006493:Heparin / Q000627:therapeutic use*; D006801:Humans; D011183:Postoperative Complications / Q000517:prevention & control*; D011655:Pulmonary Embolism / Q000188:drug therapy*; D013924:Thrombophlebitis / Q000517:prevention & control*
D006493:Heparin