Abstract
Rivaroxaban (Xarelto®), an oral oxazolidinone-based anticoagulant, is a potent, selective, direct inhibitor of factor Xa that is used in the prevention of venous thromboembolism (VTE) in adult patients after total hip replacement (THR) or total knee replacement (TKR) surgery.
In large, clinical trials, oral rivaroxaban 10mg once daily was more effective than subcutaneous enoxaparin 40mg once daily in preventing postoperative VTE in patients undergoing THR or TKR surgery. Rivaroxaban was associated with significantly lower incidences of the primary endpoint, total VTE (composite of deep vein thrombosis, non-fatal pulmonary embolism, or death from any cause) compared with enoxaparin regimens across all studies. For example, in the largest trial in patients undergoing THR, total VTE occurred in 1.1% of rivaroxaban recipients and 3.7% of enoxaparin recipients (absolute risk reduction 2.6% [95% CI 1.5, 3.7]) in the modified intent-to-treat population.
Notably, the greater efficacy of rivaroxaban was achieved without a significant increase in the incidence of major bleeding episodes compared with enoxaparin; bleeding events were the most frequently reported adverse events across clinical trials. Pyrexia, vomiting, nausea, and constipation were the most frequently reported of the non-bleeding treatment-emergent adverse events in rivaroxaban recipients and occurred at a similar rate to that with enoxaparin treatment.
In addition, preliminary pharmacoeconomic analyses in Canada and the US indicate that rivaroxaban is a cost-saving treatment strategy versus enoxaparin.
Although the position of rivaroxaban relative to other therapies remains to be fully determined, it is an effective option for the prophylaxis of VTE following THR and TKR.
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Various sections of the manuscript reviewed by:
A. Diamantopoulos, Symmetron Limited, London, UK; A. Sasahara, Cardiovascular Division, Brigham & Women’s Hospital, Boston, MA, USA; C. Colwell, Scripps Clinic, Shiley Center for Orthopaedic Research and Education, La Jolla, CA, USA; J. Fareed, Department of Pathology, Loyola University Medical Center, Chicago, IL, USA; H. Rupprecht, Medizinische Klinik, GPR Klinikum RUsselsheim, RUsselsheim, Germany; T. M. Hyers, CARE Clinical Research, St. Louis, MO, USA.
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Sources: Medical literature (including published and unpublished data) on ‘rivaroxaban’ in the prevention of venous thromboembolism in patients undergoing orthopedic surgery was identified by searching databases since 1996 (including MEDLINE and EMBASE and in-house AdisBase), bibliographies from published literature, clinical trial registries/databases and websites (including those of regional regulatory agencies and the manufacturer). Additional information (including contributory unpublished data) was also requested from the company developing the drug.
Search strategy: MEDLINE, EMBASE and AdisBase search terms were ‘rivaroxaban’ and ‘venous thromboembolism’ or ‘venous thromboembolism prevention’ and ‘orthopedic’ or ‘orthopaedic’ or ‘orthopaedic procedures’ or ‘arthroplasty’ or ‘surgery or knee’ or ‘hip’. Searches were last updated on 11 January 2012.
Selection: Studies for prevention of venous thromboembolism in patients undergoing orthopedic surgery who received rivaroxaban. Inclusion of studies was based mainly on the methods section of the trials. When available, large, well controlled trials with appropriate statistical methodology were preferred. Relevant pharmacodynamic and pharmacokinetic data are also included.
Index terms: Rivaroxaban, venous thromboembolism, deep vein thrombosis, pulmonary embolism, pharmacodynamics, pharmacokinetics, therapeutic use, tolerability.
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Duggan, S.T. Rivaroxaban. Am J Cardiovasc Drugs 12, 57–72 (2012). https://doi.org/10.2165/11208470-000000000-00000
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DOI: https://doi.org/10.2165/11208470-000000000-00000