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OBJECTIVE: Numerous mechanisms have been proposed for the no-reflow phenomenon (NRP) in the literature including leukocyte intravascular plugging, microembolisms, and extrinsic coagulation pathway activation. Some of the more recent studies suggested a relationship between NRP and systemic immune-inflammation index (SII) in different contexts. To this end, the objective of this study was to investigate the relationship between NRP and SII in acute coronary syndrome (ACS) patients with coronary artery bypass grafting (CABG) who underwent percutaneous transluminal coronary angioplasty (PTCA) or percutaneous coronary intervention (PCI) of saphenous vein graft (SVG). PATIENTS AND METHODS: The sample of this retrospective study consisted of 124 ACS patients with CABG who underwent PTCA/PCI of SVG. RESULTS: The incidence of NRP in the study group was 30.6%(n= 38). The results of …