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Objectives: Coronary artery ectasia (CAE) has been defined as a dilated artery luminal diameter that is at least 50% greater than the diameter of the normal portion of the artery. Isolated CAE is defined as CAE without significant coronary artery stenosis and isolated CAE has more pronounced inflammatory symptoms. Neutrophil to lymphocyte ratio (NLR) is widely used as a marker of inflammation and an indicator of cardiovascular outcomes in patients with coronary artery disease. We examined a possible association between NLR and the presence of isolated CAE. Study design: In this study, 2345 patients who underwent coronary angiography for suspected or known ischemic heart disease were evaluated retrospectively. Following the application of exclusion criteria, our study population consisted of 81 CAE patients and 85 age-and gender-matched subjects who proved to have normal coronary angiograms. Baseline neutrophil, lymphocyte and other hematologic indices were measured routinely prior to the coronary angiography. Results: Patients with angiographic isolated CAE had significantly elevated NLR when compared to the patients with normal coronary artery pathology (3.39±1.36 vs. 2.25±0.58, p< 0.001). A NLR level≥ 2.37 measured on admission had a 77% sensitivity and 63% specificity in predicting isolated CAE at ROC curve analysis. In the multivariate analysis, hypercholesterolemia (OR= 2.63, 95% CI 1.22-5.65, p= 0.01), obesity (OR= 3.76, 95% CI 1.43-9.87, p= 0.007) and increased NLR (OR= 6.03, 95% CI 2.61-13.94, p< 0.001) were independent predictors for the presence of isolated CAE. Conclusion: Neutrophil to …