the prophylactic affect of dihydroergotamine-heparin ( 0.5 mg dihydroergotamine plus 5,000 units of heparin administered twice daily ) against postoperative thromboembolic complications after gastrointestinal surgery was compared with the affect of 5,000 units of heparin administered three times daily in a controlled , randomized study .
C0032787
postoperative
C0019134
heparin