Comparative effectiveness of direct oral anticoagulants versus low-molecular weight heparins for the prevention of venous thromboembolism after total hip or knee replacement: A nationwide database cohort study

Pharmacol Res. 2019 Mar;141:201-207. doi: 10.1016/j.phrs.2018.12.018. Epub 2018 Dec 21.

Abstract

Background: Venous thromboembolism (VTE) after total knee or hip replacement (TKR, THR) is usually prevented with low-molecular weight heparin (LMWH), and increasingly by direct oral anticoagulants (DOAC). The aim of the present study was to compare the benefit-risk and medical costs of DOAC vs. LMWH in a real-life setting.

Methods: All patients with THR or TKR in France between Jan-1st 2013 and Sep-30th 2014, discharged to home, were identified and followed-up for 3 months in the French nationwide claims database, SNDS. DOAC users were 1:1 matched with LWMH users on gender, age and propensity score. Relative risks (RR) of hospitalized VTE, hospitalized bleeding and death were estimated using quasi-Poisson models. Medical costs were calculated according to the societal perspective, including total cost for outpatient claims and national DRG costs for hospitalisations.

Results: Most DOAC users (≥ 98.8%) were matched to a LMWH patient. For the 63,238 matched THR patients, the 3-month absolute risk of VTE was 0.9‰ with DOAC and 2.5‰ with LMWH (RR = 0.35 [0.23 to 0.54]), of bleeding 1.8‰ and 2.1‰ (0.88 [0.62-1.25]), death 0.7‰ and 1.1‰ (0.68 [0.40-1.15]). For the 31,440 matched TKR patients, risks were 1.6‰ and 2.3‰ (0.69 [0.42-1.16]) for VTE, 2.4‰ and 3.8‰ (0.64 [0.43 to 0.97]) for bleeding, and 0.6‰ and 0.8‰ (0.69 [0.30-1.62]) for all-cause death. Mean medical costs were 28% and 21% lower with DOAC than LMWH for THR and TKR, respectively. This nationwide study found a very low risk of VTE, hospitalized bleeding and death after THR or TKR discharge in patients with VTE prevention in real-life setting, with better benefit-risk profiles of DOAC compared to LMWH, and associated cost savings.

Keywords: Effectiveness; Risk; Total hip replacement; Total knee replacement; Venous thromboembolism prevention.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Anticoagulants / economics
  • Anticoagulants / therapeutic use*
  • Arthroplasty, Replacement, Hip* / economics
  • Arthroplasty, Replacement, Knee* / economics
  • Cohort Studies
  • Databases, Factual
  • Female
  • France
  • Health Care Costs
  • Hemorrhage / chemically induced
  • Hemorrhage / economics
  • Heparin, Low-Molecular-Weight / economics
  • Heparin, Low-Molecular-Weight / therapeutic use*
  • Humans
  • Male
  • Middle Aged
  • Treatment Outcome
  • Venous Thromboembolism / economics
  • Venous Thromboembolism / prevention & control*

Substances

  • Anticoagulants
  • Heparin, Low-Molecular-Weight