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Hemolytic-uremic syndrome: an analysis of the natural history and prognostic features
Insights
Hemolytic-uremic syndrome (HUS) in children often causes acute renal failure, with younger children having better outcomes. While 60% recover fully, older children face higher mortality and severe sequelae.
Area of Science:
- Pediatric Nephrology
- Renal Medicine
- Microangiopathic Hemolytic Anemias
Background:
- Hemolytic-uremic syndrome (HUS) is a significant cause of acute renal failure in children.
- The majority of pediatric HUS cases occur in children under three years old.
Purpose of the Study:
- To analyze the clinical characteristics, etiology, treatment, and long-term outcomes of childhood HUS.
- To identify factors influencing mortality and sequelae in pediatric HUS patients.
Main Methods:
- Retrospective analysis of 67 children admitted with HUS between 1974 and 1981.
- Evaluation of clinical data, renal histology, and long-term follow-up outcomes.
Main Results:
- 52% of patients were under 3 years old; 72% required peritoneal dialysis.
- Mortality was 7%, with higher rates (42%) in children over 3 years.
- Long-term follow-up showed 60% with no sequelae, but 13% had mild sequelae, and others developed chronic renal failure or hypertension.
- Renal histology revealed thrombotic microangiopathy (TMA) in 22 cases, cortical necrosis in 12, and arterial TMA in 3, with poor prognosis in arterial TMA and cortical necrosis.
Conclusions:
- HUS in children necessitates prompt management, often involving dialysis.
- Age is a critical factor, with children over 3 years experiencing significantly worse outcomes.
- Thrombotic microangiopathy and cortical necrosis are key histological findings impacting prognosis.
Abstract:
Sixty-seven children with hemolytic-uremic syndrome (HUS) were admitted between 1974 and 1981. Of these, 52 (78%) were aged less than 3 years. All children had acute renal failure and 48 (72%) required peritoneal dialysis. The etiology in twenty cases varied from bacterial and viral infections (7 and 5 cases, respectively) to renal irradiation with chemotherapy (2) and preexisting glomerulopathy (1). 5 (7%) children died during the acute phase of the illness. Long-term follow-up (mean 3 years 3 months) of 56 cases showed that 37 children (60%) had so far experienced no functional sequelae and 8 (13%) only mild sequelae while 3 (5%) were on iterative hemodialysis, 3 had severe chronic renal failure and high blood pressure (HBP) and 5 (8%) had HBP and normal kidney function. While the recovery rate was approximately 60% in all age groups, the mortality rate and serious after-effects were twice as frequent (42%) in children over 3 years of age as in those less than 3. Renal histology (total of 37) showed 12 cases of cortical necrosis, 22 of glomerular thrombotic microangiopathy (TMA) and 3 arterial TMA. Prognosis was poor for all cases of arterial TMA and 58% of those exhibiting cortical necrosis.