Validating a Lower Urine Output Criteria in Predicting Death in Critically Ill Patients
- Author:
Azrina Md Ralib
;
Mohd Basri Mat Nor
- Publication Type:Original Article
- Keywords:
Urine Output, Intensive Care Unit, Acute Kidney Injury, Death, Dialysis
- From:
The International Medical Journal Malaysia
2017;16(1):45-52
- CountryMalaysia
- Language:English
-
Abstract:
Introduction: Urine output provides a rapid estimate for kidney function, and its use has been incorporated
in the diagnosis of acute kidney injury. However, not many studies had validated its use compared to the
plasma creatinine. It has been showed that the ideal urine output threshold for prediction of death or the
need for dialysis was 0.3 ml/kg/h. We aim to assess this threshold in our local ICU population. Methods:
This was a secondary analysis of an observational study done in critically ill patients. Hourly urine output
data was collected, and a moving average of 6-hourly urine output was calculated over the first 48 hours of
ICU admission. AKIuo was defined if urine output ≤ 0.5 ml/kg/h, and UO0.3 was defined as urine output ≤ 0.3
ml/kg/h. Results: 143 patients were recruited into the study, of these, 87 (61%) had AKIuo, and 52 (36%) had
UO0.3. The AUC of AKIuo in predicting death was 0.62 (0.51 to 0.72), and UO0.3 was 0.66 (0.55 to 0.77). There
was lower survival in patients with AKIuo and UO0.3 compared to those without (p=0.01, and 0.001,
respectively). However, only UO0.3 but not AKIuo independently predicted death (HR 2.44 (1.15 to 5.18).
Conclusions: A threshold of 6 hourly urine output of 0.3 ml/kg/h but not 0.5 ml/kg/h independently
predictive of death. This support previous finding of a lower threshold of urine output criteria for optimal
prediction.
