Bilirubin Levels are Associated With Contrast-Induced Nephropathy in Peripheral Artery Disease

The relationship between contrast-induced nephropathy (CIN) and oxidative mechanisms is well documented. Our aim was to demonstrate the possible relationship between CIN and serum bilirubin as an antioxidant molecule. This retrospective study included 359 patients with peripheral artery disease (PAD) who underwent peripheral diagnostic angiography; 179 developed CIN after the intervention and another 180 were the control group, matched for age, gender, and cardiovascular risk factors. Baseline, 48- to 72-hour, and 30-day laboratory values, major adverse cardiovascular events, and dialysis requirements were recorded. Patients with CIN had significantly higher levels of uric acid, red cell distribution width, and neutrophil-to-lymphocyte ratio (NLR) but lower total bilirubin compared to the control patients ( P < .05). Multivariate logistic regression analysis showed that diabetes mellitus, left ventricular ejection fraction, uric acid, NLR, and total bilirubin levels were independent predictors of CIN development ( P = .01, P = .001, P = .001, P = .01, and P = .001, respectively). This study demonstrated that decreased total bilirubin was associated with CIN development after the administration of radiocontrast agents in patients with PAD.