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[Correspondence] Hydration and contrast-induced kidney injury

Iodinated contrast is commonly used in gastroenterology practice and clinicians endeavour to avoid complications. The hypothesis tested by Estelle Nijssen and colleagues1 was whether hydration with saline might mitigate the complication of renal failure. However, the investigators did not measure or report the hydration status—as in preimaging urine osmolarity—of the patients before the intervention.