• Rohit J Timal, Judith Kooiman, SijpkensYvo W JYWJDepartment of Internal Medicine, Haaglanden Medisch Centrum Bronovo, The Hague, the Netherlands., de VriesJean-Paul P MJPMDepartment of Vascular Surgery, St Antonius Hospital, Nieuwegein, the Netherlands.Department of Vascular Surgery, University Medical Centre Groningen, Groningen, the Netherlands., Iris J A M Verberk-Jonkers, BrulezHarald F HHFHDepartment of Internal Medicine, Onze Lieve Vrouwe Gasthuis, Amsterdam, the Netherlands., Marjolijn van Buren, Aart J van der Molen, Suzanne C Cannegieter, Hein Putter, Wilbert B van den Hout, J Wouter Jukema, Ton J Rabelink, and Menno V Huisman.
• Department of Cardiology, Leiden University Medical Center, Leiden, the Netherlands.
• JAMA Intern Med. 2020 Apr 1; 180 (4): 533-541.

ImportancePrevention of postcontrast acute kidney injury in patients with stage 3 chronic kidney disease (CKD) by means of prehydration has been standard care for years. However, evidence for the need for prehydration in this group is limited.ObjectiveTo assess the renal safety of omitting prophylactic prehydration prior to iodine-based contrast media administration in patients with stage 3 CKD.Design, Setting, And ParticipantsThe Kompas trial was a multicenter, noninferiority, randomized clinical trial conducted at 6 hospitals in the Netherlands in which 523 patients with stage 3 CKD were randomized in a 1:1 ratio to receive no prehydration or prehydration with 250 mL of 1.4% sodium bicarbonate administered in a 1-hour infusion before undergoing elective contrast-enhanced computed tomography from April 2013 through September 2016. Final follow-up was completed in September 2017. Data were analyzed from January 2018 to June 2019.InterventionsIn total, 262 patients were allocated to the no prehydration group and 261 were allocated to receive prehydration. Analysis on the primary end point was available in 505 patients (96.6%).Main Outcomes And MeasuresThe primary end point was the mean relative increase in serum creatinine level 2 to 5 days after contrast administration compared with baseline (noninferiority margin of less than 10% increase in serum creatinine level). Secondary outcomes included the incidence of postcontrast acute kidney injury 2 to 5 days after contrast administration, mean relative increase in creatinine level 7 to 14 days after contrast administration, incidences of acute heart failure and renal failure requiring dialysis, and health care costs.ResultsOf 554 patients randomized, 523 were included in the intention-to-treat analysis. The median (interquartile range) age was 74 (67-79) years; 336 (64.2%) were men and 187 (35.8%) were women. The mean (SD) relative increase in creatinine level 2 to 5 days after contrast administration compared with baseline was 3.0% (10.5) in the no prehydration group vs 3.5% (10.3) in the prehydration group (mean difference, 0.5; 95% CI, -1.3 to 2.3; P < .001 for noninferiority). Postcontrast acute kidney injury occurred in 11 patients (2.1%), including 7 of 262 (2.7%) in the no prehydration group and 4 of 261 (1.5%) in the prehydration group, which resulted in a relative risk of 1.7 (95% CI, 0.5-5.9; P = .36). None of the patients required dialysis or developed acute heart failure. Subgroup analyses showed no evidence of statistical interactions between treatment arms and predefined subgroups. Mean hydration costs were €119 (US $143.94) per patient in the prehydration group compared with €0 (US $0) in the no prehydration group (P < .001). Other health care costs were similar.Conclusions And RelevanceAmong patients with stage 3 CKD undergoing contrast-enhanced computed tomography, withholding prehydration did not compromise patient safety. The findings of this study support the option of not giving prehydration as a safe and cost-efficient measure.Trial RegistrationNetherlands Trial Register Identifier: NTR3764.

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