The Association of Systemic Immune-Inflammation Index (SII), Systemic Immune-Response Index (SIRI), and Neutrophil-to-Lymphocyte Ratio (NLR) with Cesarean Scar Pregnancy (CSP)

To evaluate the association of the Systemic Immune-Inflammation Index (SII), Systemic Immune-Response Index (SIRI), and Neutrophil-to-Lymphocyte Ratio (NLR) with Cesarean Scar Pregnancy (CSP) This prospective case-control study was conducted in Ankara City Hospital perinatology clinic between 2022-2023. The diagnosis of CSP was made by transabdominal and transvaginal ultrasound. NLR, SII, and SIRI values were compared between those diagnosed with CSP (n=23) and healthy pregnancies (n=126) at the time of first admission. The study group had significantly higher NLR, SII, and SIRI values compared to the controls. Optimal cut-off values were 3.79 (69% sensitivity, 78.2% specificity), 1180.6 (76.7% sensitivity, 72.7% specificity), and, 1.9 (83.3% sensitivity, 72.7% specificity) for NLR, SII, and SIRI, respectively. When NLR, SII and SIRI values were compared between CSP cases and pregnant women who had previous history of cesarean section but did not have CSP, significantly higher SII values were observed in the CSP group. The optimal cut-off value of SII was found to be 804.4 in predicting CSP among cases with previous history of cesarean delivery (73.9% sensitivity, 66.2% specificity). SII, SIRI, and NLR may be useful in predicting cesarean scar pregnancy in pregnant women.