alexa RIFLE criteria for acute kidney injury are associated with hospital mortality in critically ill patients: a cohort analysis.
Nephrology

Nephrology

Journal of Nephrology & Therapeutics

Author(s): Hoste EA, Clermont G, Kersten A, Venkataraman R, Angus DC,

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Abstract INTRODUCTION: The lack of a standard definition for acute kidney injury has resulted in a large variation in the reported incidence and associated mortality. RIFLE, a newly developed international consensus classification for acute kidney injury, defines three grades of severity--risk (class R), injury (class I) and failure (class F)--but has not yet been evaluated in a clinical series. METHODS: We performed a retrospective cohort study, in seven intensive care units in a single tertiary care academic center, on 5,383 patients admitted during a one year period (1 July 2000-30 June 2001). RESULTS: Acute kidney injury occurred in 67\% of intensive care unit admissions, with maximum RIFLE class R, class I and class F in 12\%, 27\% and 28\%, respectively. Of the 1,510 patients (28\%) that reached a level of risk, 840 (56\%) progressed. Patients with maximum RIFLE class R, class I and class F had hospital mortality rates of 8.8\%, 11.4\% and 26.3\%, respectively, compared with 5.5\% for patients without acute kidney injury. Additionally, acute kidney injury (hazard ratio, 1.7; 95\% confidence interval, 1.28-2.13; P < 0.001) and maximum RIFLE class I (hazard ratio, 1.4; 95\% confidence interval, 1.02-1.88; P = 0.037) and class F (hazard ratio, 2.7; 95\% confidence interval, 2.03-3.55; P < 0.001) were associated with hospital mortality after adjusting for multiple covariates. CONCLUSION: In this general intensive care unit population, acute kidney 'risk, injury, failure', as defined by the newly developed RIFLE classification, is associated with increased hospital mortality and resource use. Patients with RIFLE class R are indeed at high risk of progression to class I or class F. Patients with RIFLE class I or class F incur a significantly increased length of stay and an increased risk of inhospital mortality compared with those who do not progress past class R or those who never develop acute kidney injury, even after adjusting for baseline severity of illness, case mix, race, gender and age.
This article was published in Crit Care and referenced in Journal of Nephrology & Therapeutics

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