The Acute Kidney Injury Network (AKIN) criteria applied in burns

Area of Science:

• Nephrology
• Trauma Surgery
• Critical Care Medicine

Background:

• Acute Kidney Injury (AKI) diagnosis and staging are critical in patient management.
• The Risk, Injury, Failure, Loss, and End-stage (RIFLE) criteria have been used for AKI classification.
• The Acute Kidney Injury Network (AKIN) developed modified criteria in 2007, including a 0.3 mg/dl serum creatinine change within 48 hours.

Purpose of the Study:

• To apply AKIN criteria to severely burned patients.
• To compare the prevalence, stage, and mortality impact of AKIN criteria versus RIFLE criteria in burn patients.
• To evaluate the diagnostic and prognostic accuracy of AKIN criteria in this specific population.

Main Methods:

• Retrospective analysis of 1973 burn patients admitted between June 2003 and December 2008.
• Classification of AKI using both AKIN and RIFLE criteria by three independent referees.
• Univariate and multivariate analyses to assess the impact of AKI stages on mortality.

Main Results:

• AKI prevalence was 33% with AKIN criteria and 24% with RIFLE criteria.
• AKIN criteria identified 41% of stage 1 AKI patients missed by RIFLE criteria.
• Mortality increased nearly 8-fold in patients with AKI (OR 7.8).
• AKIN criteria demonstrated a significantly higher area under the receiver operator characteristic curve (0.877) for predicting in-hospital mortality compared to RIFLE criteria (0.838).

Conclusions:

• The AKIN criteria identify a significant cohort of burn patients with AKI who might be missed by RIFLE criteria.
• AKIN criteria appear more precise and predictive of death than RIFLE criteria in severely burned patients.
• Prospective validation of AKIN criteria in burn populations is recommended.