Analysis of Risk Factors Independently Associated with Cognitive Impairment in Patients with Permanent Atrial Fibrillation: A Cross-sectional Observational Study

Abstract

Background and objective

Atrial Fibrillation (AF) is associated with an increased risk of stroke and development of cognitive impairment. Our cross-sectional study aims to identify risk factors for cognitive impairment in patients with permanent AF.

Materials and methods

212 consecutive outpatients with history of permanent AF lasting more than 1 year were enrolled and the Short Portable Mental Status Questionnaire (SPMSQ) was used to assess cognitive impairment (number of errors ≥5). The type of antithrombotic therapy, the time in therapeutic range (TTR) in case of treatment with warfarin and the degree of heart rate (HR) control (upon Holter ECG monitoring) were also assessed.

Results

ROC curve analysis indicated that TTR was associated with cognitive impairment (AUC 0.85 ± 0.03; 95% CI 0.77–0.88; p < 0.0001). Multivariate logistic regression analysis showed an independent association of previous cerebrovascular or cardiovascular events (OR 7.24, 95% CI 1.37–38.25; p = 0.020), aspirin therapy instead of anticoagulant therapy (OR 24.74, 95% CI 1.27–482.12; p = 0.034), warfarin use with TTR ≤60% (OR 21.71 , 95%CI 4.35–108; p < 0.001) and an average daily HR either <60 bpm or >100 bpm (OR 6.04, 95% 1.09–33.29; p = 0.039) with cognitive impairment.

Conclusion

Among patients with permanent AF, cognitive impairment is more frequent in those with inadequate antithrombotic therapy (aspirin therapy instead of anticoagulant therapy) and with suboptimal oral anticoagulation (TTR ≤60%) or heart rate control. Efforts should be made to optimize therapies related to these parameters.