in a randomized , prospective , double-blind trial , the effect of conventional low-dose heparin ( 5,000 units every 8 hours ) was compared with that of a low molecular weight fragment ( 2165 lmwh , kabi vitrum ab , starting 2,500 units 2 hr before surgery , and then 5,000 units subcutaneously every morning for 9 days ) .
C0019134
heparin
C0019139
lmwh