Table of Contents
Thrombosis
Volume 2013, Article ID 563217, 6 pages
http://dx.doi.org/10.1155/2013/563217
Clinical Study

Biomarkers of Coagulation and Fibrinolysis during Cemented Total Hip Arthroplasty with Pre- versus Postoperative Start of Thromboprophylaxis

1Department of Orthopaedics, Martina Hansens Hospital, Postboks 23, 1306 Baerum Postterminal, Norway
2Innlandet Hospital Trust, 2381 Brumunddal, Norway
3Thrombosis Research Institute, London SW36LR, UK
4Department of Orthopaedics, Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway

Received 29 July 2013; Accepted 1 November 2013

Academic Editor: David Bergqvist

Copyright © 2013 Pål O. Borgen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Venous thrombosis is common in elective hip surgery, and prophylaxis is recommended. Clinical trials suggest that the drug dose and timing of initiating prophylaxis significantly influence antithrombotic effectiveness and safety. We studied the time course and gradient of plasma coagulation and fibrinolysis during total hip arthroplasty (THA) in twenty patients that were randomly assigned to have the first dose of 5000 IU dalteparin subcutaneously (sc) injected 12 hours before or 6 hours after surgery. Baseline characteristics were similar in both groups. Specific biomarkers on coagulation (prothrombin fragment 1+2 (F1+2)) and fibrinolytic activity (plasmin/α2-antiplasmin complex (PAP) and D-dimer) were collected at six events during hospitalization and analysed. There were no significant group differences in the biomarkers at any time point. The highest concentrations were measured 6 hours after surgery and before the first postoperative injection. A marked decrease followed at the first postoperative day, and then a second increase in plasma concentrations was observed 6 days after surgery. This study showed that activation of coagulation and fibrinolysis by the operative trauma was the same when the first dose of dalteparin was injected 12 hours before or 6 hours after surgery.