For those aged 75 and older with atrial fibrillation, the average decline was about three to four points faster every five years, compared to people without atrial fibrillation.
Scores below 78 points are associated with dementia, Thacker said.
The researchers predicted that on average, those without atrial fibrillation would score below 78 when they were 87, while people with atrial fibrillation would score below 78 when they were 85.
More information For more on atrial fibrillation, visit the American Heart Association.
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