Predictive value of inflammatory factors on contrast‐induced acute kidney injury in patients who underwent an emergency percutaneous coronary intervention

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Abstract
Background: Contrast‐induced acute kidney injury (CI‐AKI) is one of the most serious complications in patients who undergo percutaneous coronary intervention (PCI), especially in those with acute coronary syndrome. It has been shown that inflammation may play an important role in the pathophysiology of CI‐AKI.Hypothesis: Inflammatory factors may play a predominant role in the prediction of CI‐AKI in patients who undergo emergency PCI.Methods: Patients who underwent emergency PCI from 2013 to 2015 were consecutively enrolled and were divided into CI‐AKI and non–CI‐AKI groups. Logistic analysis was used to identify the risk factors of CI‐AKI. Receiver operator characteristic curve analysis was performed to evaluate the area under the curve (AUC) and to establish the optimal cutoff.Results: A total of 1061 patients were included, and the CI‐AKI rate was 5.47% (58/1061). Logistic analysis showed that the white blood cell (WBC) count (odds ratio [OR]: 1.103, 95% confidence interval [CI]: 1.018‐1.195, P = 0.016), neutrophil (N) count (OR: 1.134, 95% CI: 1.045‐1.232, P = 0.003), neutrophil to lymphocyte ratio (NLR) (OR: 1.105, 95% CI: 1.044‐1.169, P = 0.001), C‐reactive protein (CRP) level (OR: 1.006, 95% CI: 1.001‐1.011, P = 0.020), high‐sensitivity C‐reactive protein (hs‐CRP) level (OR: 1.099, 95% CI: 1.020‐1.184, P = 0.013), and big endothelin‐1 (ET‐1) level (OR: 4.030, 95% CI: 1.989‐8.165, P < 0.001) were all significant predictors for CI‐AKI, as was the left ventricular ejection fraction and diuretic administration. The AUC of the big ET‐1 level was the highest (0.793, 95% CI: 0.733‐0.853), followed by the NLR (0.708, 95% CI: 0.641‐0.774), hs‐CRP level (0.705, 95% CI: 0.627‐0.782), CRP level (0.684, 95% CI: 0.607‐0.761), N count (0.655, 95% CI: 0.584‐0.726), WBC count (0.620, 95% CI: 0.544‐0.695), and erythrocyte sedimentation rate (0.611, 95% CI: 0.527‐0.695).Conclusions: The WBC count, N count, NLR, CRP level, hs‐CRP level, and big ET‐1 level are all associated with an increased risk of CI‐AKI, and among which, the big ET‐1 level, NLR, and the hs‐CRP level might have high predictive value for CI‐AKI after an emergency PCI.

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