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The Journal of Bone and Joint Surgery, Vol 73, Issue 4 494-502, Copyright © 1991 by Journal of Bone and Joint Surgery, Inc
Low-molecular-weight heparinoid compared with warfarin for prophylaxis of deep-vein thrombosis in patients who are operated on for fracture of the hip. A prospective, randomized trial
TN Gerhart, HS Yett, LK Robertson, MA Lee, M Smith and EW Salzman
Department of Orthopaedic Surgery, Beth Israel Hospital, Boston, Massachusetts 02115.
In a randomized, prospective trial, a low-molecular-weight heparinoid (Org
10172 [Lomoparan]) was compared with warfarin for efficacy and safety in
preventing deep-vein thrombosis in 263 patients who had an operatively
treated fracture of the hip. One group of patients received Org 10172 in a
dose of 750 units subcutaneously every twelve hours until the ninth
postoperative day; on the seventh postoperative day, warfarin was added to
the regimen. The other group received only warfarin. Both drugs were begun
preoperatively, immediately after the admission evaluation. In the patients
who received warfarin, the desired prothrombin time was one and one-half
times the control level. Deep-vein thrombosis was detected by
125I-fibrinogen scanning and impedance plethysmography and was confirmed by
phlebography and compression ultrasonography. Deep-vein thrombosis was
found in nine (7 per cent) of the 132 patients who received Org 10172 and
in twenty-eight (21 per cent) of the 131 patients who received warfarin (p
less than 0.001). Adverse reactions were not significantly different in the
two groups. Major bleeding complications occurred in eight patients in the
Org-10172 group, only four of whom were receiving the drug at the time of
bleeding, and in five patients who were receiving warfarin (not
significant). There was no difference in intraoperative loss of blood or in
requirements for transfusion. We concluded that the low-molecular-weight
heparinoid Org 10172 is a safe, convenient, effective antithrombotic agent
for the prevention of venous thrombosis after an operation for fracture of
the hip.

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