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Original article
Risk of drug-induced liver injury with the new oral anticoagulants: systematic review and meta-analysis
  1. Daniel Caldeira1,2,
  2. Márcio Barra1,2,
  3. Ana Teresa Santos1,2,
  4. Daisy de Abreu1,2,
  5. Fausto J Pinto3,
  6. Joaquim J Ferreira1,2,
  7. João Costa1,2,4,5
  1. 1Clinical Pharmacology Unit, Instituto de Medicina Molecular, Lisbon, Portugal
  2. 2Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Medicine, University of Lisbon, Lisboa, Portugal
  3. 3Cardiology Department, CCUL, CAML, Faculty of Medicine, Lisbon, Portugal
  4. 4Evidence Based Medicine Centre, Faculty of Medicine, University of Lisbon, Portugal
  5. 5Portuguese Collaborating Centre of the Cochrane Iberoamerican Network, Faculty of Medicine, University of Lisbon, Portugal
  1. Correspondence to Dr Daniel Caldeira, Laboratório de Farmacologia Clínica e Terapêutica, Faculdade de Medicina da Universidade de Lisboa, Av Prof Egas Moniz, Lisboa 1649-028, Portugal; dgcaldeira{at}hotmail.com

Abstract

Objective In recent years, safety alerts have been made warning of the risk of serious drug-induced liver injury (DILI) caused by cardiovascular drugs. The new oral anticoagulants (NOACs) have now reached the market. However, safety concerns have been raised about their hepatic safety. Therefore we aimed to evaluate NOAC liver-related safety.

Methods Systematic review and meta-analysis of phase III randomised controlled trials (RCTs). Medline and CENTRAL were searched to September 2013. Reviews and reference lists were also searched. Two reviewers independently searched for studies and retrieved data estimates. Primary outcome was DILI (transaminases elevations >3× upper limit of normal (ULN) with total bilirubin >2× ULN). NOACs were compared against any control group. Random-effects meta-analysis was performed, and pooled estimates were expressed as relative risk (RR) and 95% CI heterogeneity was evaluated with I2 test.

Results Twenty-nine RCTs evaluating 152 116 patients (mean follow-up of 16 months) were included. All RCTs were rated as having low risk of bias. NOAC were not associated with an increased risk of DILI (RR 0.90, 95% CI 0.72 to 1.13, I2=0%). Similar results were obtained for individual NOAC (rivaroxaban, apixaban, dabigatran, darexaban, edoxaban) and considering the different control groups (vitamin K antagonists, low molecular weight heparin (LMWH) and placebo). The risk of transaminases elevations (>3×ULN) was lower among NOAC-treated patients, in particular in comparison with LMWH-treated patients (RR 0.71, 95% CI 0.59 to 0.85; I2=27%)

Conclusions NOACs are not associated with an increased risk of DILI. The unexpected ‘protective’ effect of NOAC is probably due to LMWH-associated hepatotoxicity.

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