Atrial fibrillation and mortality in an elderly population

Area of Science:

• Cardiology
• Epidemiology
• Gerontology

Background:

• Atrial fibrillation (AF) is a prevalent arrhythmia in elderly populations.
• Previous studies suggest a link between AF and increased mortality, but comprehensive data on specific causes and risk factors remain crucial.

Purpose of the Study:

• To investigate the association between atrial fibrillation and mortality in an elderly cohort.
• To identify specific cardiovascular conditions and risk factors associated with AF.
• To analyze the impact of time and age on mortality risk in patients with AF.

Main Methods:

• Prospective cohort study utilizing data from the Busselton, Western Australia health surveys (1966-1981).
• Follow-up of 1770 individuals aged over 60 years until 1983.
• Statistical analysis using proportional hazards regression to adjust for multiple confounding factors.

Main Results:

• Atrial fibrillation was diagnosed in 87 elderly participants (40 prevalent, 47 incident).
• AF was associated with angina, myocardial infarction history, and left bundle branch block.
• Adjusted relative mortality for AF was 1.92 (all causes), 1.82 (cardiovascular excluding stroke), and 3.78 (stroke).
• Excess mortality risk from stroke was highest in younger women and increased over time since AF detection.
• Mortality risk reduction with increasing age was observed for both sexes.

Conclusions:

• Atrial fibrillation significantly increases mortality risk, particularly from stroke, in the elderly.
• The findings underscore the importance of considering anticoagulant therapy in selected AF patients.
• Age and sex modify the stroke-related mortality risk associated with atrial fibrillation.