the effect of low-molecular weight ( lmw ) heparin fragment ( one injection of 1500 aptt [ activated partial thromboplastin time ] -u/24 h ) -- group 1 -- was compared with unfractionated ( uf ) heparin ( 3 x 5000 iu/24 h ) -- group 2 -- in a randomized prospective double-blind trial of 404 patients ( 202 patients in each group ) , aged 50 years or older , undergoing abdominal surgery .
C0019139
low-molecular weight
C0019134
unfractionated