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Ivabradine and Atrial Fibrillation Incidence: A Nested Matching Study.

Kibum Kim1, Jasmeen Keur2, Halie Anderson3

  • 1Department of Pharmacy Systems and Outcomes and Policy, University of Illinois at Chicago, Chicago, Illinois, USA; Department of Pharmacotherapy, University of Utah Health, Salt Lake City, Utah, USA.

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|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Ivabradine (IVB) use in heart failure (HF) patients was linked to a significantly higher risk of developing atrial fibrillation (AF). This 180-day study highlights a critical safety concern for HF patients on IVB therapy.

Keywords:
atrial fibrillationhealth careheart failureivabradineoutcomes assessment

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Area of Science:

  • Cardiology
  • Pharmacology
  • Clinical Research

Background:

  • Ivabradine (IVB) is prescribed to reduce hospitalization risk in heart failure (HF) patients.
  • The association between IVB and atrial fibrillation (AF) risk in HF patients remains unclear.

Purpose of the Study:

  • To evaluate the risk of new-onset atrial fibrillation (AF) in heart failure (HF) patients treated with Ivabradine (IVB).

Main Methods:

  • Retrospective observational study using health plan claims data.
  • Compared new AF diagnoses in adult HF patients receiving IVB versus matched controls (no IVB) over 180 days.
  • Utilized Cox proportional hazards regression to analyze AF risk, controlling for baseline characteristics.

Main Results:

  • The study included 107 IVB patients and 321 matched controls, well-balanced for age, sex, HF type, and comorbidities.
  • Patients receiving IVB had a significantly higher adjusted hazard ratio (HR) of 7.293 (95% CI: 4.985-10.668) for developing AF.
  • This indicates a more than seven-fold increased risk of AF in the IVB group.

Conclusions:

  • Heart failure patients receiving Ivabradine demonstrated a significantly elevated risk of developing atrial fibrillation within 180 days.
  • Further research is necessary to elucidate the mechanisms behind this association and address potential confounding factors.
  • Investigating unmeasured risk factors and confounding by indication is crucial for understanding IVB's impact on AF incidence.