Safety of a rapid outpatient hydration protocol for patients with renal impairment requiring intravenous iodinated contrast media for CT.

INTRODUCTION Patients receiving intravenous iodinated contrast media (IOCM) for CT are predisposed to contrast-induced nephropathy. Chronic kidney disease is an important risk factor, and hydration is the mainstay of prevention. While inpatients can undergo intravenous hydration, there is a knowledge deficit regarding regimens for outpatients. We employed a rapid outpatient hydration protocol to reduce postponement of scan appointments for patients with suboptimal estimated glomerular filtration rate (eGFR). METHODS From June 2015, we amended our CT preparation protocol to mandate rapid hydration (oral, intravenous or both) for patients with an eGFR of 30-60 mL/min/1.73 m2. Patients receiving this hydration protocol from June to November 2015 were followed up for one month to monitor any admissions for fluid overload, and up to one year to determine the long-term effect on eGFR. RESULTS 226 outpatients received the hydration protocol, which correlated with a 95% reduction in postponement of imaging appointments. No complications of fluid overload from hydration were encountered. There was a significant association between age and decrease in eGFR, but this was not significant when stratified by drop in eGFR category. No statistical significance was found between decrease in eGFR and gender or race. Higher baseline eGFR was less likely to be associated with decrease in eGFR after imaging. Type of hydration was not related to a drop in eGFR category for patients with eGFR of 45-59 mL/min/1.73 m2. CONCLUSION We defined a shorter hydration regimen that is safe to use in the outpatient setting.