We evaluated the predictive value of admission systemic immune-inflammation index (SII) for the risk of contrast-induced nephropathy (CIN) in patients with ST-segment elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (pPCI). The neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and SII (platelet × NLR) levels were calculated in 1621 consecutive patients with STEMI. The relationship of these parameters with CIN development within 72 hours of pPCI was analyzed. Of the study population, 343 (21.1%) cases developed CIN. The frequency of CIN was 11.1% in the first SII quartile, 11.6% in the second SII quartile, 26.8% in the third SII quartile, and 35% in the fourth SII quartile, which differed significantly between groups ( P < .01). Age, baseline glomerular filtration rate, contrast media volume, hypertension, C-reactive protein levels, and the quartiles of SII were independent predictors of CIN. Patients in the third SII quartile versus first SII quartile (OR: 2.906, 95% CI, 1.903-4.437; P < .001), and fourth SII quartile versus first SII quartile (OR: 4.168, 95% CI, 2.754-6.313; P < .001) had a significantly higher risk for CIN in the multivariable model. The SII may be a promising inflammatory parameter to predict CIN after pPCI.

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In this study, we aimed to evaluate the predictive value of admission C-reactive protein/albumin ratio (CAR) for acute kidney injury (AKI) in cases with moderate to severe chronic kidney disease (CKD) not on dialysis who presented with non-ST-segment elevation myocardial infarction (NSTEMI) and underwent coronary angiography (CAG). This cross-sectional and observational study included 420 NSTEMI patients. The study population was categorized based on the CAR tertiles as groups T1, T2, and T3. The primary outcome of the study was AKI development; 92 (21.9%) cases developed AKI. The frequency of AKI was significantly higher in the T3 group compared with the T2 and T1 groups (34% vs 17% vs 14%, P < .001). Age, estimated glomerular filtration rate, contrast media volume, and CAR (odds ratio: 1.36; 95% CI: 1.17-1.57; P < .01) were significant predictors of AKI. In a receiver operating characteristic curve analysis, CAR levels >0.20 predicted AKI development with a sensitivity of 74% and a specificity of 45%. We observed that the CAR may be a promising inflammatory parameter for AKI in NSTEMI patients with moderate to severe CKD after CAG.