Supplementary Material for: Effect of Angiotensin-Converting Enzyme Inhibitors in Contrast-Induced Nephropathy: A Meta-Analysis

<b><i>Aims:</i></b> The purpose of this study was to evaluate the effect of angiotensin-converting enzyme inhibitors (ACEIs) on contrast-induced nephropathy (CIN) in patients undergoing coronary angiography or percutaneous coronary intervention (PCI). <b><i>Methods:</i></b> We searched the Medline, Embase, Cochrane Library, China National Knowledge Infrastructure, Chongqing VIP database and Wanfang database up to December 2014. Pooled risk ratios (RRs) or weighted mean difference (WMD) with their 95% CIs for the CIN incidence, serum creatinine (SCr), estimated glomerular filtration rate (eGFR) and blood urea nitrogen (BUN) of the patients were collected and calculated using the software Review Manager 5.2. <b><i>Results:</i></b> A total of 12 separate studies including 1,868 patients (1,011 ACEI cases and 857 controls) were considered in the meta-analysis. The overall RR of the incident CIN in the ACEI group vs. the control group was 0.95 (95% CI 0.57-1.58), and the total WMDs of the ΔSCr, ΔeGFR and ΔBUN were -0.01 (95% CI -0.04 to 0.02), 5.71 (95% CI -0.66 to 12.09) and 0.78 (95% CI -0.16 to 1.73), respectively. Besides, the RR of CIN incidence in the captopril group vs. the control group was 0.72 (95% CI 0.25-2.05, p = 0.54), and the pooled WMD of the ΔSCr was -0.13 (95% CI -0.21 to -0.06, p < 0.01). <b><i>Conclusion:</i></b> This meta-analysis suggests that ACEIs administration has no significant influence in the CIN of patients undergoing coronary angiography or PCI; however, captopril might have the potential to prevent CIN.