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Updated: Apr 5, 2026

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Atrial fibrillation and sudden cardiac death, a nested case-control study looking at cardiac pathology

Isaac Chung1, Mary Sheppard1, Joseph Westaby1

  • 1Cardiology Clinical Academic Group, Molecular and Clinical Sciences Research Institute, City St George's, University of London, London SW17 0RE, UK.

Cardiovascular Pathology : the Official Journal of the Society for Cardiovascular Pathology
|April 4, 2026
PubMed

Insights

Atrial fibrillation (AF) is linked to higher risks of sudden cardiac death (SCD), particularly in younger individuals with cardiomyopathy. Early heart failure treatment may prevent AF development and reduce SCD risk.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Sudden Cardiac Death Research

Background:

  • Atrial fibrillation (AF) is a prevalent heart rhythm disorder, increasing sudden cardiac death (SCD) risk.
  • Atrial enlargement, often due to heart failure, elevates the risk of developing AF.

Purpose of the Study:

  • To investigate cardiac diseases associated with AF in individuals who experienced SCD.
  • To compare cardiac pathologies between SCD cases with and without AF.

Main Methods:

  • Retrospective cohort study comparing SCD cases with and without AF.
  • Age and sex-matched controls were used.
  • Cardiac diseases and characteristics were analyzed between groups.

Main Results:

  • Cardiomyopathy was significantly more common in AF patients (32 vs 15, p=0.01).
  • Sudden arrhythmic death syndrome (SADS) was underrepresented in AF cases (46 vs 27, p=0.01).
  • Ischemic heart disease and other cardiac pathologies showed similar prevalence in both groups.

Conclusions:

  • AF is a significant concern in cardiomyopathy, associated with increased SCD risk, especially in younger individuals.
  • Aggressive heart failure management is crucial to prevent atrial enlargement and subsequent AF development.

Keywords:
Atrial fibrillationAutopsyCardiac pathologyCardiomyopathySudden cardiac death

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