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Laboratory and clinical variables to predict outcome in hemolytic-uremic syndrome
P L Havens1, P P O'Rourke, J Hahn
1Department of Pediatrics, Children's Hospital, Boston.
Insights
A simple test using serum calcium and urine output can predict outcomes for children with hemolytic-uremic syndrome. This aids in identifying severe cases early for better patient management.
Area of Science:
- Pediatric Nephrology
- Critical Care Medicine
- Clinical Diagnostics
Background:
- Hemolytic-uremic syndrome (HUS) is a serious condition in children, often leading to severe complications.
- Accurate prognostic indicators are crucial for timely intervention and management of pediatric HUS cases.
- Previous prognostic models for HUS lacked sufficient predictive power in early disease stages.
Purpose of the Study:
- To develop and validate a predictive guide for the prognosis of pediatric patients diagnosed with hemolytic-uremic syndrome.
- To identify early clinical and laboratory markers associated with poor outcomes in children with HUS.
- To establish a simple, accessible test for predicting severe sequelae or mortality in HUS patients.
Main Methods:
- Retrospective review of medical records for 78 pediatric patients diagnosed with HUS between 1976 and 1986.
- Patients were categorized into 'good outcome' (no sequelae) and 'bad outcome' (death, chronic renal failure, CNS sequelae) groups.
- Bivariate analysis was used to compare routine laboratory tests within 48 hours of admission between outcome groups.
Main Results:
- A combination of low serum calcium (≤ 2 mmol/L) and low urine output (< 0.4 mL/kg/h) over 24 hours was identified as a significant predictor.
- This predictive test demonstrated high performance: 75% sensitivity, 98% specificity, and 90% positive predictive value for adverse outcomes.
- The identified markers effectively distinguished patients who died, developed chronic renal failure, or had severe central nervous system sequelae.
Conclusions:
- Serum calcium and urine output levels within 24 hours of admission are valuable early prognostic indicators for pediatric HUS.
- This simple bedside test can accurately identify children at high risk for severe complications or mortality from HUS.
- The findings provide a practical guide for clinicians to anticipate HUS prognosis and tailor patient management strategies.
Abstract:
To develop a guide to the prognosis of children with hemolytic-uremic syndrome, we reviewed the medical records of 78 patients with this diagnosis seen at The Children's Hospital, Boston, from 1976 through 1986. Two outcome groups were defined as follows: a "good outcome" group, which contained 6 patients with no serious sequelae at hospital discharge, and a "bad outcome" group, which contained 12 patients who died, had chronic renal failure, or had central nervous system sequelae at hospital discharge. Differences between the two groups in routine laboratory tests available within 48 hours of admission were identified by bivariate analysis. Using serum calcium (less than or equal to 2 mmol/L) plus urine output (less than 0.4 mL/kg/h) over a 24-hour period as a test to predict outcome, we identified patients who died, had chronic renal failure, or had serious central nervous system sequelae, with 75% sensitivity, 98% specificity, and 90% positive predictive value.