Clinical Orthopaedics and Related Research®

, Volume 470, Issue 9, pp 2591–2598

Blood Loss in Cemented THA is not Reduced with Postoperative Versus Preoperative Start of Thromboprophylaxis

Authors

    • Martina Hansens Hospital
  • Ola E. Dahl
    • Department of OrthopaedicsInnlandet Hospital Trust
    • Thrombosis Research Institute
  • Olav Reikerås
    • Department of OrthopaedicsOslo University Clinic
Clinical Research

DOI: 10.1007/s11999-012-2320-9

Cite this article as:
Borgen, P.O., Dahl, O.E. & Reikerås, O. Clin Orthop Relat Res (2012) 470: 2591. doi:10.1007/s11999-012-2320-9

Abstract

Background

Thrombin formation commences perioperatively in orthopaedic surgery and therefore some surgeons prefer preoperative initiation of pharmacologic thromboprophylaxis. However, because of the potential for increased surgical bleeding, the postoperative initiation of thromboprophylaxis has been advocated to reduce blood loss, need for transfusion, and bleeding complications. Trials on timing of thromboprophylaxis have been designed primarily to detect thrombotic events, and it has been difficult to interpret the magnitude of blood loss and bleeding events owing to lack of information for bleeding volume and underpowered bleeding end points.

Questions/purposes

We therefore asked whether there are differences in blood loss, transfusion requirements, and other postoperative clinical complications with preoperative versus postoperative start of thromboprophylaxis with dalteparin.

Methods

In a double-blind, randomized controlled trial, 80 patients undergoing primary cemented THA were allocated to dalteparin injections starting 12 hours before or 6 hours after surgery. Blood loss was measured by weighing sponges and drapes, volume in suction drains during surgery, and wound drains until removal 24 hours postoperatively. Hemoglobin and hematocrit were recorded at predefined times during and after surgery.

Results

We found no differences in blood loss (1081 mL ± 424 mL versus 1023 mL ± 238 mL), bleeding-related events (10% versus 17%), or number of patients who had transfusions (12 versus five) with preoperative and postoperative thromboprophylaxis, respectively. Other complications were few in both groups.

Conclusions

Our data suggest blood loss is similar with preoperative and postoperative initiation of dalteparin thromboprophylaxis, but indicate a trend toward fewer transfusion requirements which might favor postoperative start of thromboprophylaxis.

Level of Evidence

Level I, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

Supplementary material

11999_2012_2320_MOESM1_ESM.doc (68 kb)
Supplementary material 1 (DOC 68 kb)

Copyright information

© The Association of Bone and Joint Surgeons® 2012