A predictive score for atrial fibrillation in poststroke patients

Background Atrial fibrillation (AF) is a risk factor for cerebral ischemia. Identifying the presence of AF, especially in paroxysmal cases, may take time and lacks clear support in the literature regarding the optimal investigative approach; in resource-limited settings, identifying a higher-risk group for AF can assist in planning further investigation. Objective To develop a scoring tool to predict the risk of incident AF in the poststroke follow-up. Methods A retrospective longitudinal study with data collected from electronic medical records of patients hospitalized and followed up for cerebral ischemia from 2014 to 2021 at a tertiary stroke center. Demographic, clinical, laboratory, electrocardiogram, and echocardiogram data, as well as neuroimaging data, were collected. Stepwise logistic regression was employed to identify associated variables. A score with integer numbers was created based on beta coefficients. Calibration and validation were performed to evaluate accuracy. Results We included 872 patients in the final analysis. The score was created with left atrial diameter >= 42 mm (2 points), age >= 70 years (1 point), presence of septal aneurysm (2 points), and score >= 6 points at admission on the National Institutes of Health Stroke Scale (NIHSS; 1 point). The score ranges from 0 to 6. Patients with a score >= 2 points had a fivefold increased risk of having AF detected in the follow-up. The area under the curve (AUC) was of 0.77 (0.72-0.85). Conclusion We were able structure an accurate risk score tool for incident AF, which could be validated in multicenter samples in future studies.