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Long term use of donepezil and QTc prolongation
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  • Jason Kho,
  • Adam Ioannou,
  • Amit Mandal,
  • Andrew Cox,
  • Ashraf Nasim,
  • Sofia Metaxa,
  • Constantinos Missouris
Jason Kho
Wexham Park Hospital
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Adam Ioannou
Royal Free London NHS Foundation Trust
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Amit Mandal
Wexham Park Hospital
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Andrew Cox
Wexham Park Hospital
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Ashraf Nasim
Wexham Park Hospital
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Sofia Metaxa
Wexham Park Hospital
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Constantinos Missouris
Wexham Park Hospital
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Abstract

Background and Purpose: The neurocognitive benefits of donepezil are well recognised, but the potential side effects on cardiac conduction remain unclear. Our objectives are to investigate whether long-term donepezil therapy is associated with electrocardiographic (ECG) changes and in particular to assess its effects on the QT interval. Experimental approach: We conducted a single centre retrospective analysis of patients admitted to our institution on donepezil therapy over a 12-month period. 59 patients were identified as suitable for analysis. An admission resting 12-lead ECG was obtained and compared to their ECG prior to commencement of donepezil therapy to assess for any significant difference in ECG parameters. Key Results: Donepezil significantly prolonged the PR (P=0.04), QRS (P=0.04) and QT (P=0.002) intervals. The increase in QT intervals remained significant on correction for heart rate; resulting in 8 (13.6%) patients developing high arrhythmogenic risk based on assessment using QT nomogram plots. Concomitant use of tricyclic antidepressants was associated with significant QT prolongation, while use of rate limiting calcium channel blockers was associated with significant PR prolongation, and beta-blockers with reduction in heart rate. Conclusion and Implications: Our results clearly demonstrate that long-term use of donepezil results in prolongation of the QT interval. We suggest ECG evaluation should take place before and after donepezil initiation, and clinicians should be even more vigilant in those prescribed tricyclic antidepressants.

Peer review status:Published

01 Jul 2020Published in Clinical Toxicology on pages 1-7. 10.1080/15563650.2020.1788054