Current Paper of the week

Current Paper of the week

  • Paper of the Week: Aspirin or Rivaroxaban for VTE Prophylaxis after Hip or Knee Arthroplasty

    Anderson DR, Dunbar M, Murnaghan J, et al. Aspirin or rivaroxaban for VTE
    prophylaxis after hip or knee arthroplasty. New England Journal of Medicine. 2018;378(8):699-
    707.
    doi: https://doi.org/10.1056/nejmoa1712746

    Summary by Alexis Kasper

    Administration of anticoagulant prophylaxis after a total hip or knee arthroplasty has
    been shown to reduce complications and death rates that are associated with venous
    thromboembolism, or VTE.1-3 Established guidelines have recommended that patients receive
    anticoagulant prophylaxis for 14 days after surgery.4

    Anderson et al. conducted a prospective study that evaluated the efficacy of aspirin, an
    inexpensive and widely used antiplatelet drug, in preventing venous thromboembolism. The
    researchers assessed the effectiveness and safety of extended prophylaxis with aspirin and
    compared it to rivaroxaban, a typical direct oral anticoagulant. All patients were given in-
    hospital prophylaxis with rivaroxaban starting on the day of surgery until postoperative day 5.
    Then the participants who underwent total knee arthroplasty were randomly assigned to continue
    to receive thromboprophylaxis with rivaroxaban for the remaining 9 days or were told to take
    aspirin instead of the rivaroxaban. Similarly, those who underwent a total hip arthroplasty were
    placed into either of the above groups but for 30 days, since it was suggested that prophylaxis
    can continue for up to 35 days after surgery.4

    Effectiveness and safety were both evaluated as trial outcomes. The primary effectiveness
    outcome was adjudicated symptomatic VTE while the primary safety outcomes were major and
    any bleeding. Secondary outcomes included death, stroke, myocardial infarction, and wound
    infection, according to Anderson et al. The researchers found no significant between-group
    differences in VTE, major bleeding, and any bleeding. Out of the 1717 patients who took only
    rivaroxaban, 12 presented with VTE, 5 experienced major bleeding, and 17 experienced any
    bleeding. Similarly, out of the 1707 patients who took rivaroxaban and then switched over to aspirin, 11 patients presented with VTE, 8 patients experienced major bleeding, and 22 patients
    experienced any bleeding.

    In conclusion, Anderson et al. found that aspirin was not significantly different from an
    oral anticoagulant such as rivaroxaban for preventing venous thromboembolism, and, therefore,
    aspirin can be a safe and effective choice for preventing VTE after a total hip or knee
    arthroplasty.

    References:

    1. Hull RD, Pineo GF, Stein PD, et al. Extended out-of-hospital low-molecularweight
    2. heparin prophylaxis against deep venous thrombosis in patients after elective hip
    3. arthroplasty: a systematic review. Ann Intern Med 2001;135:858-69.
    4. Eikelboom JW, Quinlan DJ, Douketis JD. Extended-duration prophylaxis against venous
      thromboembolism after total hip or knee replacement: a meta-analysis of the randomised
      trials. Lancet 2001;358: 9-15.
    5. O’Donnell M, Linkins LA, Kearon C, Julian J, Hirsh J. Reduction of out-of-hospital
      symptomatic venous thromboembolism by extended thromboprophylaxis with low-
      molecular-weight heparin following elective hip arthroplasty: a systematic review. Arch
      Intern Med 2003;163:1362-6.
    6. Falck-Ytter Y, Francis CW, Johanson NA, et al. Prevention of VTE in orthopedic surgery
      patients: Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American
      College of Chest Physicians Evidence-Based Clinical Practice Guidelines. Chest
      2012;141(2):e278S-e325S
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