Pulmonary thromboembolism; prevention of fatal postoperative.
D000368:Aged; D006493:Heparin / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D011183:Postoperative Complications / Q000517:prevention & control; D011655:Pulmonary Embolism / Q000401:mortality / Q000517:prevention & control*
D006493:Heparin