Postcontrast incidences of CIN and mortality at 35 days are significantly higher in the population with eGFR <30 mL/min/1.73 m than in the former high-risk population with eGFR 30 to 59 mL/min/1.73 m, even after prophylactic intravenous hydration. The risk of complications of prophylactic intravenous hydration is similar and substantial in both populations. Obtaining evidence from a randomized trial that efficacy of prophylactic intravenous hydration outweighs the risk of complications is important but may not be feasible.
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