Tailored hydration for the prevention of contrast-induced acute kidney injury after coronary angiogram or PCI: A systematic review and meta-analysis

Contrast-induced acute kidney injury (CI-AKI) is a frequent complication of coronary interventions associated with an increased risk of mortality and morbidity. The optimal intravenous hydration strategy to prevent CI-AKI is not well-established. The primary objective is to determine if a tailored hydration strategy reduces the risk of CI-AKI and of major adverse cardiovascular events (MACE) in patients undergoing coronary angiography compared with a non-tailored hydration strategy. A study-level meta-analysis of randomized controlled trials comparing tailored versus non-tailored hydration strategies for the prevention of CI-AKI (primary outcome) and of MACE (main secondary outcome) in patients undergoing coronary angiography for any indication was performed. Tailored hydration was defined as the administration of intravenous fluids based on patient-specific parameters other than weight only. A total of 13 studies were included (n = 4,458 participants). The overall risk of bias was moderate. A tailored strategy was associated with a significant reduction in the risk of CI-AKI (RR=0.56, 95% CI, [0.46-0.69], p<0.00001; I 2 =26%), and of MACE (RR=0.57, 95% CI, [0.42-0.78], p=0.0005; I 2 =12%). A tailored hydration strategy was not associated with a significant reduction in the other pre-specified secondary outcomes, except for all-cause mortality (RR=0.57, 95% CI, [0.35, 0.94], p=0.03; I 2 =0%). The impact of a tailored strategy on the primary outcome was consistent in sensitivity analyses. These results suggest that tailored hydration is superior to non-tailored hydration in reducing the risk of CI-AKI and MACE in patients undergoing coronary angiography. Future trials are required to identify the optimal tailored hydration strategy.