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[Familial Mediterranean fever--an important differential diagnosis in systemic juvenile chronic arthritis]
Abstract:
Familial Mediterranean Fever (FMF), characterized by recurring episodes of fever, serositis, arthritis, skin changes and complicated by amyloidosis in 30%-60% of cases frequently begins in childhood. Systemic juvenile rheumatoid arthritis (systemic JRA, Still's disease) is the most important differential diagnosis. In our series of 10 patients the mean age of onset was 4.9 +/- 2.2 years (range 2-9 years). The mean time period elapsed before the diagnosis was established was 4.1 +/- 2.7 years (range 1.5-10 years). Three of our 10 patients already had developed renal amyloidosis at the time of diagnosis. Essential criteria for differential diagnosis against systemic JRA were positive family history for FMF (4/10), ethnic background (9/10 of Turkish decent), typical erysipeloid skin rashes (4/10), attacks of abdominal pain accompanied by fever (10/10) and the characteristic pattern of recurrent episodes lasting only a few days each (a patient's diary monitoring the attacks may be helpful). In problematic cases the metaraminol provocative test can be helpful. If an elevated plasma dopamine beta-hydroxylase activity appears to be a specific finding in FMF patients, this may well open up new avenues in the early diagnosis of the disease. Since amyloidosis can be prevented by prophylactic long lasting treatment with colchicine, a timely diagnosis of FMF is the physician's challenge.
Insights
Familial Mediterranean Fever (FMF) often begins in childhood and is frequently misdiagnosed as juvenile rheumatoid arthritis. Early diagnosis is crucial to prevent amyloidosis through colchicine treatment.
Area of Science:
- Rheumatology
- Genetics
- Pediatrics
Context:
- Familial Mediterranean Fever (FMF) is an autoinflammatory disease presenting in childhood with recurrent fever, serositis, and arthritis.
- Amyloidosis is a common complication, affecting 30%-60% of FMF patients.
- Systemic juvenile rheumatoid arthritis (JRA) is a key differential diagnosis.
Purpose:
- To highlight diagnostic challenges in differentiating FMF from systemic JRA in children.
- To identify key clinical features aiding in FMF diagnosis.
- To emphasize the importance of early FMF diagnosis for preventing amyloidosis.
Summary:
- A series of 10 pediatric FMF patients showed a mean age of onset of 4.9 years and a diagnostic delay of 4.1 years.
- Renal amyloidosis was present at diagnosis in 30% of patients.
- Diagnostic criteria included family history, Turkish ethnicity, erysipeloid rashes, abdominal pain with fever, and short-lived recurrent episodes.
Impact:
- Timely diagnosis of FMF is essential for initiating prophylactic colchicine treatment, thereby preventing debilitating amyloidosis.
- Elevated plasma dopamine beta-hydroxylase may serve as a specific biomarker for early FMF detection.
- Distinguishing FMF from systemic JRA requires careful evaluation of clinical presentation and patient history.