Atrial size, atrial fibrillation, and stroke

Area of Science:

• Cardiology
• Neurology
• Medical Imaging

Background:

• Atrial fibrillation is a common arrhythmia associated with increased risk of ischemic stroke.
• The role of left atrial size in stroke risk stratification for atrial fibrillation patients requires further elucidation.

Purpose of the Study:

• To investigate the association between left atrial size and ischemic stroke in patients with atrial fibrillation.
• To determine if left atrial enlargement is a significant risk factor for stroke in this population.

Main Methods:

• Retrospective review of M-mode and two-dimensional echocardiographic images.
• Analysis of left atrial size in 20 patients with atrial fibrillation and ischemic stroke (no valvular disease) and 20 controls with atrial fibrillation but no stroke.
• Left atrial size was measured blinded to patient group.

Main Results:

• Left atrial enlargement was detected in 90% of patients with atrial fibrillation and ischemic stroke.
• In contrast, only 20% of patients with atrial fibrillation but no stroke exhibited left atrial enlargement.
• A significant difference in left atrial size was observed between the stroke and nonstroke groups.

Conclusions:

• Left atrial enlargement is strongly associated with ischemic stroke in patients with atrial fibrillation.
• Enlarged left atria may represent an independent risk factor for stroke in individuals with atrial fibrillation.
• Echocardiographic assessment of left atrial size could aid in stroke risk stratification for atrial fibrillation patients.