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    Systemic Immune Inflammation Index is a Novel Marker in Predicting the Presence and Severity of Isolated Coronary Artery Ectasia
    (Sociedade Brasileira de Cardiologia, 2023) Dindas, Ferhat; Koyun, Emin; Turkyilmaz, Erdem; Abacioglu, Ozge Ozcan; Yildirim, Arafat; Sahin, Anil; Dindar, Baris
    Background: The underlying pathology of isolated coronary artery ectasia (CE) has not been fully elucidated. Objective: We aimed to examine the relationship between the systemic immune inflammation index (Sıı), which corresponds to the multiplying of the neutrophil-to-lymphocyte ratio (NLR) and the platelet counts, and isolated CE. Method: The retrospective study population included 200 patients with isolated CE, 200 consecutive with obstructive coronary artery disease, and 200 consecutive with a normal coronary artery angiogram. A 2-sided p-value of <0.05 was considered significant. Results: Sıı, NLR, platelet-to-lymphocyte ratio (PLR), and monocyte-to-high density lipoprotein cholesterol ratio (MHR) were significantly higher in the CE group compared with the other groups (all p<0.001). In multivariate analysis, Sıı (p<0.001, OR = 1.005, 95% CI =1.004-1.005) was found to be an independent predictor of isolated CE. In Receiver Operating Characteristic curve analysis, Sıı had a higher Area Under the Curve than NLR, PLR, and MHR. Sıı value of >517.35 has 79% sensitivity, 76% specificity for the prediction of the CE [AUC: 0.832, (p<0.001)]. Sıı had a significant correlation with the number of ectatic coronary arteries and Markis classification (r:0.214 p=0.002; r:-0.195, p=0.006, respectively). Conclusion: To the best of our knowledge, this is the first study that Sıı was significantly associated with isolated CE presence and anatomical severity. © 2023, Sociedade Brasileira de Cardiologia. All rights reserved.