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  • Title: Use of RIFLE criteria to predict the severity and prognosis of acute kidney injury in emergency department patients with rhabdomyolysis.
    Author: Delaney KA, Givens ML, Vohra RB.
    Journal: J Emerg Med; 2012 May; 42(5):521-8. PubMed ID: 21549548.
    Abstract:
    BACKGROUND: RIFLE criteria (Risk, Injury, Failure, Loss, End-stage) have not been evaluated in Emergency Department (ED) patients at risk of acute kidney injury (AKI). AKI occurs in rhabdomyolysis. STUDY OBJECTIVES: To use RIFLE criteria to stratify the severity of AKI and predict prognosis in ED patients with acute rhabdomyolysis. METHODS: This is a retrospective study of consecutive patients with rhabdomyolysis over a 44-month period. Data included ED admission anion gap, blood urea nitrogen (BUN), calcium, phosphate, potassium, urinalysis, toxicology screen, and hematocrit. Creatine kinase, creatinines, and hematocrits were followed serially. Hospital length of stay (LOS) and need for dialysis were also recorded. RESULTS: RIFLE categories were calculated for 135 patients. At admission, 60 (44%) had no AKI, 20 (15%) had Risk, 32 (24%) had Injury, and 23 (17%) had Failure. These categories were significantly associated with increasing magnitude of volume depletion, potassium, phosphate, BUN, and the anion gap. They predicted differences in LOS, dialysis, discharge creatinine, and the rate of normalization of the admission creatinine. Mortality was low (2%), as was morbidity. Only 8/132 surviving patients (6%) were discharged with a creatinine >2 mg/dL. CONCLUSIONS: The RIFLE categories correlated significantly with known markers of rhabdomyolysis and AKI. They also predicted LOS, dialysis, renal morbidity, and the timing of recovery. RIFLE criteria could be used to predict the outcome of ED patients and facilitate admission and discharge decisions.
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