Neutrophil-to-Lymphocyte Ratio Is a Prognostic Marker in Acute Ischemic Stroke

Background: Neutrophil-to-lymphocyte ratio is an independent predictor of mortality in patients with acute ischemic stroke. However, it is uncertain whether neutrophil-to-lymphocyte ratio is related with functional outcome and recurrent ischemic stroke. In this study, we aimed to investigate the relationship of neutrophil-to-lymphocyte ratio with stroke severity, functional outcome, and recurrent ischemic stroke after acute ischemic stroke. Methods: A total of 280 patients with acute ischemic stroke were included in the study. Patients were divided into 3 groups according to the neutrophil-to-lymphocyte ratio value (<2, 2-3, >3). Demographic, clinical, and laboratory data were collected for all patients. We evaluated the association between neutrophil-to-lymphocyte ratio and (1) stroke severity on admission, (2) functional outcome at 3 months, and (3) recurrent ischemic stroke. Regression analyses were performed, adjusting for confounders. Results: After adjustment for potential confounders, neutrophil-to-lymphocyte ratio was associated with an increased risk of stroke severity on admission (odds ratio [OR] 1.364, 95% confidence interval [CI] 1.101-1.690, P=.005) and primary unfavorable outcome (OR 1.455, 95% CI 1.083-1.956, P=.013). After a median of 1.13 years (interquartile range. 91-1.42) of follow-up, neutrophil-to-lymphocyte ratio was associated with recurrent ischemic stroke after adjustment (hazard ratio 1.499, 95% CI 1.161-1.935, P=.002). Conclusions: Our study suggests that neutrophil-to-lymphocyte ratio is associated with stroke severity on admission, primary unfavorable functional outcome, and recurrent ischemic stroke in patients with acute ischemic stroke.