• Nephrol. Dial. Transplant. · Mar 2012

    Fluid overload at initiation of renal replacement therapy is associated with lack of renal recovery in patients with acute kidney injury.

    • Michael Heung, Dawn F Wolfgram, Mallika Kommareddi, Youna Hu, Peter X Song, and Akinlolu O Ojo.
    • Division of Nephrology, Department of Medicine, University of Michigan, Ann Arbor, MI, USA. mheung@umich.edu
    • Nephrol. Dial. Transplant. 2012 Mar 1;27(3):956-61.

    BackgroundPatients with acute kidney injury (AKI) requiring initiation of renal replacement therapy (RRT) have poor short- and long-term outcomes, including the development of dialysis dependence. Currently, little is known about what factors may predict renal recovery in this population.MethodsWe conducted a single-center, retrospective analysis of 170 hospitalized adult patients with AKI attributed to acute tubular necrosis who required inpatient initiation of RRT. Data collection included patient characteristics, laboratory data, details of hospital course and degree of fluid overload at RRT initiation. The primary outcome was recovery of renal function to dialysis independence.ResultsWithin 1 year of RRT initiation, 35.9% (61/170) of patients reached the primary end point of renal recovery. The median (interquartile range) duration of RRT was 11 (3-33) days and 83.6% (51/61) recovered prior to hospital discharge. Recovering patients had significantly less fluid overload at the time of RRT initiation compared to non-recovering patients (3.5 versus 9.3%, P = 0.004). In multivariate Cox proportional hazard regression analysis, a rise in percent fluid overload at dialysis initiation remained a significant negative predictor of renal recovery (hazard ratio 0.97, 95% confidence interval 0.95-1.00, P = 0.024).ConclusionsIn patients with AKI, a higher degree of fluid overload at RRT initiation predicts worse renal recovery at 1 year. Clinical trials are needed to determine whether interventions targeting fluid overload may improve patient and renal outcomes.

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