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Atrial fibrillation: a major contributor to stroke in the elderly. The Framingham Study
Insights
Chronic atrial fibrillation significantly increases stroke risk, especially in older adults. This arrhythmia remains a major stroke contributor across all age groups, unlike other cardiovascular conditions.
Area of Science:
- Cardiology
- Neurology
- Epidemiology
Background:
- Chronic atrial fibrillation (AF) is a known risk factor for stroke, particularly in individuals without valvular heart disease.
- The relationship between AF, aging, and stroke incidence requires further elucidation.
Purpose of the Study:
- To investigate the impact of atrial fibrillation on stroke risk across different age groups.
- To quantify the contribution of atrial fibrillation to stroke incidence over a 30-year follow-up period.
Main Methods:
- Longitudinal cohort study utilizing data from the Framingham Heart Study.
- Inclusion of 5184 men and women with a 30-year follow-up period.
- Analysis of age-specific stroke incidence rates and the proportion of strokes associated with atrial fibrillation.
Main Results:
- Chronic atrial fibrillation incidence increased with age, from 0.2 per 1000 (ages 30-39) to 39.0 per 1000 (ages 80-89).
- Atrial fibrillation was associated with 14.7% of all initial strokes, with this proportion rising from 6.7% (ages 50-59) to 36.2% (ages 80-89).
- Unlike cardiac failure, coronary heart disease, and hypertension, atrial fibrillation's contribution to stroke risk did not decline with age.
Conclusions:
- Atrial fibrillation is a significant and persistent risk factor for stroke throughout the lifespan.
- The risk of stroke associated with atrial fibrillation escalates markedly with advancing age.
- Public health strategies should address atrial fibrillation management to mitigate stroke risk, particularly in elderly populations.
Abstract:
Chronic atrial fibrillation without valvular disease has been associated with increased stroke incidence. The impact of atrial fibrillation on the risk of stroke with increasing age was examined in 5184 men and women in the Framingham Heart Study. After 30 years of follow-up, chronic atrial fibrillation appeared in 303 persons. Age-specific incidence rates steadily increased from 0.2 per 1000 for ages 30 to 39 years to 39.0 per 1000 for ages 80 to 89 years. The proportion of strokes associated with this arrhythmia was 14.7%, 68 of the total 462 initial strokes, increasing steadily with age from 6.7% for ages 50 to 59 years to 36.2% for ages 80 to 89 years. In contrast to the impact of cardiac failure, coronary heart disease, and hypertension, which declined with age, atrial fibrillation was a significant contributor to stroke at all ages.