Real-life peak and trough dabigatran plasma measurements over time in hospitalized geriatric patients with atrial fibrillation

  • E. Chaussade
  • Olivier Hanon
  • C. Boully
  • F. Labourée
  • L. Caillard
  • G. Gerotziafas
  • J.-S. Vidal
  • I. Elalamy
Article

Abstract

Background

Few geriatric patients were included in studies on direct oral anticoagulants and data on dabigatran concentration and safety are needed in this population. Our objectives were to evaluate peak and trough dabigatran plasma concentrations over time in a geriatric population and to identify factors associated with dabigatran plasma concentrations and to assess the relationship with bleeding events.

Methods

Peak and trough dabigatran plasma concentration were performed 4,8,15,30,45 days after inception of dabigatran treatment in 68 consecutive patients≥75 years old hospitalized in a geriatric hospital with atrial fibrillation. Bleeding events were monitored for 1 year.

Results

Mean age was 85.8(5.1) years old and 76.5% were women. Overall, 541 dabigatran plasma measurements (270 peak, 271 trough) were performed. Mean dabigatran concentrations of the 5 sequential measurements ranged 106-146ng/mL for peak and 66-84ng/mL for trough. Renal failure was associated with high peak and trough dabigatran concentration. Inter- and intra-individual coefficients of variation were 59.5% and 44.7% for peak and 74.5% and 44.6% for trough. Participants in the lower two tertiles of dabigatran concentration at day 8 (D8) remained below the 90th percentile (243.9ng/ml) on the next measurements. Bleeding events were associated with high trough dabigatran concentrations. Trough dabigatran concentration at D8>243.9ng/mL significantly predicted bleeding.

Conclusion

In this geriatric population, renal function and low albumin were associated with dabigatran concentrations. Despite large variability, participants in the lower two tertiles of dabigatran concentration at D8 remained below the 90th percentile on the following measurements. D8 dabigatran trough concentration≥243.9ng/mL identified patients at risk of bleeding.

Key words

Anticoagulants antithrombins atrial fibrillation aged 80 and over 

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Copyright information

© Serdi and Springer-Verlag France SAS 2017

Authors and Affiliations

  • E. Chaussade
    • 1
    • 2
  • Olivier Hanon
    • 1
    • 2
    • 5
  • C. Boully
    • 1
    • 2
  • F. Labourée
    • 1
    • 2
  • L. Caillard
    • 1
    • 2
  • G. Gerotziafas
    • 3
    • 4
  • J.-S. Vidal
    • 1
    • 2
  • I. Elalamy
    • 3
    • 4
  1. 1.APHP, Hôpital BrocaParisFrance
  2. 2.Université Paris Descartes, Sorbonne Paris CitéParisFrance
  3. 3.APHP, HUEP, Hôpital TENON, Service d’Hématologie BiologiqueParisFrance
  4. 4.UMR S 938 UPMC Paris 6ParisFrance
  5. 5.Hôpital BrocaParisFrance

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