Atrial fibrillation and the risk of myocardial infarction: a nation-wide propensity-matched study

Area of Science:

• Cardiology
• Public Health
• Epidemiology

Background:

• Atrial fibrillation (AF) is a known complication of myocardial infarction (MI).
• Emerging evidence suggests AF may also increase the risk of developing MI.
• Understanding this bidirectional relationship is crucial for cardiovascular risk management.

Purpose of the Study:

• To evaluate the risk of incident myocardial infarction (MI) associated with atrial fibrillation (AF) in a large, nationwide population-based cohort.
• To investigate the influence of baseline comorbidities and therapies on AF-associated MI risk.

Main Methods:

• A nationwide cohort study using the Korean National Health Insurance Service database.
• Inclusion of 497,366 adults without prior AF or MI at baseline.
• Propensity score matching was used to compare an AF group (n=3,295) with a no-AF group (n=13,159) over a 4.2-year follow-up period.

Main Results:

• Atrial fibrillation was associated with a threefold increased risk of MI (Hazard Ratio [HR], 3.1; 95% Confidence Interval [CI], 2.22-4.37).
• This increased risk was observed in both men (HR, 2.91; 95% CI, 1.91-4.45) and women (HR, 3.52; 95% CI, 2.01-6.17).
• The risk of AF-associated MI was higher in individuals without hypertension, diabetes, ischemic stroke, or dyslipidemia at baseline, and lower in those on anticoagulant and statin therapies.

Conclusions:

• Atrial fibrillation is an independent risk factor for myocardial infarction.
• The findings highlight the need to consider MI as a significant complication of AF, beyond stroke.
• Early intervention with anticoagulants and statins may mitigate the risk of MI in patients with AF.