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Conference News Roundup—European Society of Cardiology


 

Four in 10 Patients With Atrial Fibrillation Have Unrecognized Brain Damage

Four out of 10 patients with atrial fibrillation but no history of stroke or transient ischemic attack have previously unrecognized brain damage, according to the first results of the Swiss Atrial Fibrillation Cohort Study (Swiss-AF).

“Our results suggest that clinically unrecognized brain damage may explain the association between dementia and atrial fibrillation in patients without prior stroke,” said David Conen, MD, MPH, Associate Professor of Cardiology at McMaster University in Hamilton, Canada.

Patients with atrial fibrillation have a significantly increased risk of stroke, which is why most are treated with oral anticoagulation. This increased stroke risk is probably the main reason why patients with atrial fibrillation also face an increased risk of cognitive dysfunction and dementia. The relationship between atrial fibrillation and dementia has also been shown among patients without prior strokes, however, meaning that additional mechanisms must be involved. Clarifying the mechanisms by which atrial fibrillation increases the risk of cognitive dysfunction and dementia is a first step towards developing preventive measures.

Swiss-AF is a prospective, observational study designed to pinpoint the mechanisms of cognitive decline in patients with atrial fibrillation. Dr. Conen’s analysis investigated the prevalence of silent brain damage in patients with atrial fibrillation.

The study enrolled 2,415 patients older than 65 with atrial fibrillation between 2014 and 2017 from 14 centers in Switzerland. All patients without contraindications underwent standardized brain MRI, and the images were analyzed in a central core laboratory. Scans were available in 1,736 patients. Of those patients, 347 (20%) had a history of stroke or transient ischemic attack and were excluded from the analysis.

The final analysis included 1,389 patients with atrial fibrillation but no history of stroke or transient ischemic attack. The average age of participants was 72, and 26% were women. The scans showed that 569 (41%) patients had at least one type of previously unrecognized brain damage: 207 (15%) had a cerebral infarct, 269 (19%) had microbleeds, and 222 (16%) had lacunes.

“Four in 10 patients with atrial fibrillation but no history of stroke or transient ischemic attack had clinically unrecognized silent brain lesions,” said Dr. Conen. “This brain damage could trigger cognitive decline.”

Most study participants (1,234; 89%) were treated with oral anticoagulants. Stefan Osswald, MD, Chief of Cardiology at University Hospital Basel in Switzerland, noted that the cross-sectional analysis looked at the data at a single point in time and cannot address the question of whether the cerebral infarcts and other brain lesions occurred before or after initiation of oral anticoagulation. “The findings nevertheless raise the issue that oral anticoagulation might not prevent all brain damage in patients with atrial fibrillation,” he said.

“All Swiss-AF participants underwent extensive cognitive testing. These data will be analyzed to see whether patients with silent brain lesions also have impaired cognitive function,” said Dr. Conen. Collaborations with other study groups will help determine whether these findings are specific to patients with atrial fibrillation.

Impaired Mental Status Doubles Elderly’s Risk of Death After Heart Attack

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