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NDT Advance Access originally published online on October 25, 2007
Nephrology Dialysis Transplantation 2008 23(4):1203-1210; doi:10.1093/ndt/gfm744
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© The Author [2007]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org


A multi-centre evaluation of the RIFLE criteria for early acute kidney injury in critically ill patients

Sean M. Bagshaw1,2, Carol George3, Irina Dinu4 and Rinaldo Bellomo2,5

1 Division of Critical Care Medicine, University of Alberta Hospital, University of Alberta, Edmonton, Alberta, Canada 2 Department of Intensive Care, Austin Hospital 3 Australia New Zealand Intensive Care Society (ANZICS) Adult Patient Database (APD), Melbourne, Victoria, Australia 4 Department of Public Health Sciences, School of Public Health, University of Alberta Edmonton, Alberta, Canada 5 Department of Medicine, Melbourne University, Melbourne, Victoria, Australia

Dr Sean M. Bagshaw, Division of Critical Care Medicine, University of Alberta Hospital, 3C1.16 Walter C. Mackenzie Centre, 8440-122 Street, Edmonton, Alberta T6G2B7, Canada. Tel: +1-780-407-6755; Fax: +1-780-407-1228; E-mail: bagshaw{at}ualberta.ca



  Abstract

Background. The Acute Dialysis Quality Initiative Working Group recently developed the RIFLE criteria, a consensus definition for acute kidney injury (AKI). We sought to evaluate the RIFLE criteria on the day of ICU admission in a large heterogenous population of critically ill patients.

Methods. Retrospective interrogation of prospectively collected data from the Australian New Zealand Intensive Care Society Adult Patient Database. We evaluated 120 123 patients admitted for ≥24 h from 1 January 2000 to 31 December 2005 from 57 ICUs across Australia.

Results. The median (IQR) age was 64.3 (50.8–75.4) years, 59.5% were male, 28.6% had co-morbid disease, 50.3% were medical admissions and the initial mean (±SD) APACHEII score was 16.9 (±7.7). According to the RIFLE criteria, on the day of admission, AKI occurred in 36.1%, with a maximum RIFLE category of Risk in 16.3%, Injury in 13.6%, and Failure 6.3%. AKI, defined by any RIFLE category, was associated with an increase in hospital mortality (OR 3.29, 95% CI 3.19–3.41, P < 0.0001). The crude hospital mortality stratified by RIFLE category was 17.9% for Risk, 27.7% for Injury and 33.2% for Failure. By multivariable analysis, each RIFLE category was independently associated with hospital mortality (OR: Risk 1.58, Injury 2.54 and Failure 3.22).

Conclusion. In a large heterogenous cohort of critically ill patients, the RIFLE criteria classified >36% with AKI on the day of admission. For successive increases in severity of RIFLE category, there were increases in hospital mortality. The RIFLE criteria represent a simple tool for the detection and classification of AKI and for correlation with clinical outcomes.

Keywords: acute kidney injury; acute renal failure; mortality; multi-centre; RIFLE criteria

Received for publication: 17. 8.07
Accepted in revised form: 21. 9.07


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