Risk Factors, Subsequent Disease Onset, and Prognostic Impact of Myocardial Infarction and Atrial Fibrillation

Area of Science:

• Cardiology
• Epidemiology
• Public Health

Background:

• Myocardial infarction (MI) and atrial fibrillation (AF) are common co-occurring conditions.
• Shared cardiovascular risk factors exist, but their specific associations with MI and AF onset and outcomes are not fully understood.

Purpose of the Study:

• To investigate the distinct associations of cardiovascular risk factors with the incidence of MI and AF.
• To examine the temporal relationship between MI and AF onset.
• To assess the impact of subsequent MI or AF diagnoses on overall mortality risk.

Main Methods:

• Pooled analysis of 6 European population-based cohorts including 108,363 individuals.
• Multivariable Cox regression models used to identify predictors of MI, AF, and all-cause mortality.
• Follow-up duration of up to 10 years.

Main Results:

• Risk factors like sex, blood pressure, antihypertensive treatment, and diabetes were more strongly associated with MI than AF.
• Increasing age and body mass index were more strongly associated with AF than MI.
• Smoking and high cholesterol were linked to MI but not AF; population attributable fractions were 70% for MI vs. 27% for AF.
• Subsequent diagnoses of MI after AF, and AF after MI, significantly elevated mortality risk.

Conclusions:

• MI and AF exhibit different associations with cardiovascular risk factors, suggesting distinct pathophysiological mechanisms.
• The occurrence of both MI and AF significantly increases the risk of all-cause mortality.