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Critical Care
Published in: Critical Care 1/2013

Open Access 01-02-2013 | Research

Fluid balance and urine volume are independent predictors of mortality in acute kidney injury

Authors: Catarina Teixeira, Francesco Garzotto, Pasquale Piccinni, Nicola Brienza, Michele Iannuzzi, Silvia Gramaticopolo, Francesco Forfori, Paolo Pelaia, Monica Rocco, Claudio Ronco, Clara Belluomo Anello, Tiziana Bove, Mauro Carlini, Vincenzo Michetti, Dinna N Cruz, NEFROlogia e Cura INTensiva (NEFROINT) investigators

Published in: Critical Care | Issue 1/2013

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Abstract

Introduction

In ICUs, both fluid overload and oliguria are common complications associated with increased mortality among critically ill patients, particularly in acute kidney injury (AKI). Although fluid overload is an expected complication of oliguria, it remains unclear whether their effects on mortality are independent of each other. The aim of this study is to evaluate the impact of both fluid balance and urine volume on outcomes and determine whether they behave as independent predictors of mortality in adult ICU patients with AKI.

Methods

We performed a secondary analysis of data from a multicenter, prospective cohort study in 10 Italian ICUs. AKI was defined by renal sequential organ failure assessment (SOFA) score (creatinine >3.5 mg/dL or urine output (UO) <500 mL/d). Oliguria was defined as a UO <500 mL/d. Mean fluid balance (MFB) and mean urine volume (MUV) were calculated as the arithmetic mean of all daily values. Use of diuretics was noted daily. To assess the impact of MFB and MUV on mortality of AKI patients, multivariate analysis was performed by Cox regression.

Results

Of the 601 included patients, 132 had AKI during their ICU stay and the mortality in this group was 50%. Non-surviving AKI patients had higher MFB (1.31 ± 1.24 versus 0.17 ± 0.72 L/day; P <0.001) and lower MUV (1.28 ± 0.90 versus 2.35 ± 0.98 L/day; P <0.001) as compared to survivors. In the multivariate analysis, MFB (adjusted hazard ratio (HR) 1.67 per L/day, 95%CI 1.33 to 2.09; <0.001) and MUV (adjusted HR 0.47 per L/day, 95%CI 0.33 to 0.67; <0.001) remained independent risk factors for 28-day mortality after adjustment for age, gender, diabetes, hypertension, diuretic use, non-renal SOFA and sepsis. Diuretic use was associated with better survival in this population (adjusted HR 0.25, 95%CI 0.12 to 0.52; <0.001).

Conclusions

In this multicenter ICU study, a higher fluid balance and a lower urine volume were both important factors associated with 28-day mortality of AKI patients.
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Metadata
Title
Fluid balance and urine volume are independent predictors of mortality in acute kidney injury
Authors
Catarina Teixeira
Francesco Garzotto
Pasquale Piccinni
Nicola Brienza
Michele Iannuzzi
Silvia Gramaticopolo
Francesco Forfori
Paolo Pelaia
Monica Rocco
Claudio Ronco
Clara Belluomo Anello
Tiziana Bove
Mauro Carlini
Vincenzo Michetti
Dinna N Cruz
NEFROlogia e Cura INTensiva (NEFROINT) investigators
Publication date
01-02-2013
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2013
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc12484

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