The relationship between Hyperuricemia and Contrast-induced acute kidney injury undergoing primary percutaneous coronary intervention: the protocol of secondary analysis for ATTEMPT RESCIND-1 study

Abstract

Background Contrast-induced acute kidney injury (CI-AKI) contributes toward unfavorable clinical outcomes after primary percutaneous coronary intervention (pPCI). We assessed whether hyperuricemia is an independent predictor of CI-AKI and outcomes in patients undergoing pPCI. Methods/design Our study was a secondary analysis for the database from ATTEMPT study, enrolling 560 ST-segment elevation myocardial infarction (STEMI) patients undergoing pPCI. Eligible patients received peri-procedural either via aggressive (left ventricular end-diastolic pressure guided) or routine (<=500ml) intravenous hydration with the isotonic solution (0.9% NaCl) with randomization. The primary endpoint was CI-AKI, defined as >25% or 0.5 mg/dL increase in serum creatinine from baseline during the first 48-72 hours post-procedurally. Patients were divided into 2 groups according to the admission serum uric acid (SUA) level. Hyperuricemia was defined as a SUA level >7 mg/dL (417 mmol/L) in males and >6 mg/dL (357 mmol/L) in females. Multivariate analyses for CI-AKI and long-term mortality were performed using the logistic regression and Cox regression analyses, respectively. Discussion This study will determine the predictive value of hyperuricemia for the development of CI-AKI and outcomes in patients with STEMI undergoing pPCI. We predict that hyperuricemia will be associated with a risk of CI-AKI in patients with pPCI. Furthermore, after adjusting for other variables, long-term mortality after pPCI was higher in those with hyperuricemia than in those with normouricemia. Results of this study may provide scientific evidence for the effect of hyperuricemia on CI-AKI and long-term outcomes, thereby offering the potential possibility of lowering SUA on the development of CI-AKI and outcomes.