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Critical Care
Published in: Critical Care 2/2009

Open Access 01-04-2009 | Research

Delivered dose of renal replacement therapy and mortality in critically ill patients with acute kidney injury

Authors: Sergio Vesconi, Dinna N Cruz, Roberto Fumagalli, Detlef Kindgen-Milles, Gianpaola Monti, Anibal Marinho, Filippo Mariano, Marco Formica, Mariano Marchesi, René Robert, Sergio Livigni, Claudio Ronco, the DOse REsponse Multicentre International collaborative Initiative (DO-RE-MI Study Group)

Published in: Critical Care | Issue 2/2009

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Abstract

Introduction

The optimal dialysis dose for the treatment of acute kidney injury (AKI) is controversial. We sought to evaluate the relationship between renal replacement therapy (RRT) dose and outcome.

Methods

We performed a prospective multicentre observational study in 30 intensive care units (ICUs) in eight countries from June 2005 to December 2007. Delivered RRT dose was calculated in patients treated exclusively with either continuous RRT (CRRT) or intermittent RRT (IRRT) during their ICU stay. Dose was categorised into more-intensive (CRRT ≥ 35 ml/kg/hour, IRRT ≥ 6 sessions/week) or less-intensive (CRRT < 35 ml/kg/hour, IRRT < 6 sessions/week). The main outcome measures were ICU mortality, ICU length of stay and duration of mechanical ventilation.

Results

Of 15,200 critically ill patients admitted during the study period, 553 AKI patients were treated with RRT, including 338 who received CRRT only and 87 who received IRRT only. For CRRT, the median delivered dose was 27.1 ml/kg/hour (interquartile range (IQR) = 22.1 to 33.9). For IRRT, the median dose was 7 sessions/week (IQR = 5 to 7). Only 22% of CRRT patients and 64% of IRRT patients received a more-intensive dose. Crude ICU mortality among CRRT patients were 60.8% vs. 52.5% (more-intensive vs. less-intensive groups, respectively). In IRRT, this was 23.6 vs. 19.4%, respectively. On multivariable analysis, there was no significant association between RRT dose and ICU mortality (Odds ratio (OR) more-intensive vs. less-intensive: CRRT OR = 1.21, 95% confidence interval (CI) = 0.66 to 2.21; IRRT OR = 1.50, 95% CI = 0.48 to 4.67). Among survivors, shorter ICU stay and duration of mechanical ventilation were observed in the more-intensive RRT groups (more-intensive vs. less-intensive for all: CRRT (median): 15 (IQR = 8 to 26) vs. 19.5 (IQR = 12 to 33.5) ICU days, P = 0.063; 7 (IQR = 4 to 17) vs. 14 (IQR = 5 to 24) ventilation days, P = 0.031; IRRT: 8 (IQR = 5.5 to 14) vs. 18 (IQR = 13 to 35) ICU days, P = 0.008; 2.5 (IQR = 0 to 10) vs. 12 (IQR = 3 to 24) ventilation days, P = 0.026).

Conclusions

After adjustment for multiple variables, these data provide no evidence for a survival benefit afforded by higher dose RRT. However, more-intensive RRT was associated with a favourable effect on ICU stay and duration of mechanical ventilation among survivors. This result warrants further exploration.

Trial Registration

Cochrane Renal Group (CRG110600093).
Appendix
Available only for authorised users
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Metadata
Title
Delivered dose of renal replacement therapy and mortality in critically ill patients with acute kidney injury
Authors
Sergio Vesconi
Dinna N Cruz
Roberto Fumagalli
Detlef Kindgen-Milles
Gianpaola Monti
Anibal Marinho
Filippo Mariano
Marco Formica
Mariano Marchesi
René Robert
Sergio Livigni
Claudio Ronco
the DOse REsponse Multicentre International collaborative Initiative (DO-RE-MI Study Group)
Publication date
01-04-2009
Publisher
BioMed Central
Published in
Critical Care / Issue 2/2009
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc7784

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