The optimal drug adherence to maximize the efficacy and safety of non-vitamin K antagonist oral anticoagulant in real-world atrial fibrillation patients

Daehoon Kim, Pil Sung Yang, Eunsun Jang, Hee Tae Yu, Tae Hoon Kim, Jae Sun Uhm, Jong Youn Kim, Jung Hoon Sung, Hui Nam Pak, Moon Hyoung Lee, Gregory Y.H. Lip, Boyoung Joung

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Aims: To investigate the association between adherence to non-vitamin K antagonist oral anticoagulant (NOAC) and clinical outcomes and to determine the optimal cut-off level of NOAC adherence among patients with atrial fibrillation (AF). Methods and results: Using the Korean National Health Insurance Service database, we identified 96 197 patients with non-valvular AF who initiated NOAC or warfarin in 2013-16. We compared clinical outcomes between adherent [proportion of days covered (PDC) ≥80%] vs. non-adherent (PDC <80%) NOAC users, and further with warfarin users. We assessed the outcomes according to different levels of adherence. The proportion of adherent NOAC users was 64.0%. Compared with non-adherent NOAC users, adherent NOAC users were at lower risks of ischaemic stroke/systemic embolism (SE) [adjusted hazard ratio (aHR) 0.73, 95% confidence interval (CI) 0.69-0.79], and myocardial infarction (aHR 0.82, 95% CI 0.72-0.93), whereas there was no significant risk alteration for major bleeding (aHR 1.01, 95% CI 0.91-1.11). Compared with warfarin, non-adherent NOAC use failed to have better efficacy against ischaemic stroke/SE (aHR 0.99, 95% CI 0.93-1.05) and rather had increased risk of myocardial infarction (aHR 1.13, 95% CI 1.03-1.25). In NOAC users, the risks of adverse outcomes decreased according to gradual increase of adherence rates with the lowest risks in ≥90%, except for major bleeding in which there were no significant associations. Conclusions: In an adherence level-dependent fashion, adherent use of NOAC showed better clinical outcomes without increasing bleeding risk. Maintaining ≥90% of adherence optimizes effectiveness of NOAC therapy without compromising its safety.

Original languageEnglish
Pages (from-to)547-557
Number of pages11
JournalEuropace
Volume22
Issue number4
DOIs
Publication statusPublished - 2020 Apr 1

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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