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Hemolytic-uremic syndrome and complement factor H deficiency: clinical aspects
1Department of Nephrology, The Birmingham Children's Hospital, United Kingdom. cm.taylor@bhamchildrens.wmids.nhs.uk
Seminars in Thrombosis and Hemostasis
|July 12, 2001
Summary
A rare form of hemolytic-uremic syndrome (HUS) is linked to complement factor H deficiency. This condition presents atypically, often without preceding enterocolitis, and requires further research and international registries.
Area of Science:
- Nephrology
- Immunology
- Genetics
Background:
- A subgroup of patients with hemolytic-uremic syndrome (HUS) presents with complement factor H deficiency.
- This deficiency is often identified due to persistent hypocomplementemia, though not all cases exhibit systemic hypocomplementemia.
Observation:
- These patients exhibit an atypical HUS presentation, frequently lacking a prodrome of enterocolitis.
- Precipitating factors can include various infections, and patients often develop severe hypertension early in the illness.
- The age of onset is variable, ranging from neonates to adults, with a tendency for relapse and a poor prognosis.
Findings:
- Complement factor H deficiency is a key factor in a specific subset of atypical HUS cases.
- The clinical presentation is characterized by severe hypertension, relapse potential, and variable age of onset.
- While plasma exchange with factor H replacement is a potential treatment, its efficacy requires more evidence.
Implications:
- Understanding complement factor H deficiency is crucial for diagnosing and managing atypical HUS.
- International registries are essential for promoting clinical and laboratory investigation of this rare disorder.
- Further research is needed to establish optimal treatment strategies, including managing graft recurrence after kidney transplantation.