[Risk and prevention of atrial fibrillation of non-valvular origin]

Area of Science:

• Cardiology
• Neurology
• Medical Imaging

Background:

• Atrial fibrillation (AF) is a significant independent risk factor for ischemic stroke.
• Cardioembolic strokes account for approximately 10% of ischemic strokes in AF patients.
• Identifying high-risk markers is crucial for stroke prevention in non-valvular AF.

Purpose of the Study:

• To identify clinical and echocardiographic high-risk markers for stroke in patients with non-valvular atrial fibrillation.
• To compare the prevalence of these markers in AF patients with and without a history of stroke.

Main Methods:

• Retrospective analysis of clinical and echocardiographic data from AF patients.
• Stratification into two groups: those with and without a history of stroke.
• Statistical analysis using the Poly Analyst Power package to determine stroke risk factors.

Main Results:

• Echocardiographic markers associated with high thromboembolic risk were significantly more frequent in patients with a history of stroke.
• Thrombi in the left atrium or its appendage were detected in 31% of patients with prior stroke versus 12.5% in those without.
• Independent risk factors for stroke included advanced age, longer AF duration, reduced left ventricular ejection fraction, diabetes mellitus, and arterial hypertension.

Conclusions:

• Echocardiographic findings, particularly left atrial/appendage thrombi, are significant indicators of stroke risk in non-valvular AF.
• Clinical factors such as age, AF duration, LVEF, diabetes, and hypertension are independent predictors of stroke in this population.
• These findings aid in stratifying stroke risk and guiding preventative strategies in AF patients.