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Long-term Outcome of Adult Onset Idiopathic Minimal Change Disease
1Department of Medicine, Rush Presbyterian St. Luke's Medical Center, Chicago, Illinois, USA.
Abstract:
Minimal Change Disease (MCD) is the lesion most commonly associated with nephrotic syndrome in children, accounting for over 75% of cases. Although less common, MCD still accounts for up to 30% of adult onset nephrotic syndrome. Unlike children, in whom MCD is primarily idiopathic, secondary causes of MCD are seen in 13% of adults and must be considered, as the therapeutic approach to these patients is defined by the underlying cause. Clinical features at presentation in nephrotic adults with MCD can include microscopic hematuria, hypertension, and renal insufficiency, making MCD indistinguishable clinically from focal segmental glomerulosclerosis. As a result, a renal biopsy is required in adults in order to correctly diagnose and manage the nephrotic syndrome. As in children, response to therapy leads to a complete remission of proteinuria in up to 97% of adults, although, adults require a more prolonged course of therapy (16-28 weeks) compared to children (8 weeks). Relapse of MCD is extremely common in children (71%) and can be seen in up to 85% of adult patients. Relapses occur more frequently in younger adults (< 45 years) and are often seen in the first 6-12 months after the onset of a remission. Successful treatment of relapses can often be achieved with a second course of steroids. However, up to 50% of relapsing adults become frequent relapsers or steroid dependent. In these patients, a stable remission can be induced by treatment with either cyclophosphamide or cyclosporine. Overall, the long-term outcome of adult onset MCD is excellent, with fewer than 5% of patients progressing to end-stage renal disease and a patient survival of 83%-98% at 15 years.
Insights
Minimal Change Disease (MCD) is a common cause of nephrotic syndrome in children and adults. Adult MCD requires biopsy for diagnosis, but outcomes are excellent with prompt treatment and management of relapses.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Internal Medicine
Background:
- Minimal Change Disease (MCD) is the most frequent cause of nephrotic syndrome in children (over 75%) and a significant cause in adults (up to 30%).
- Unlike pediatric cases, adult MCD can have secondary causes (13%) necessitating identification for appropriate treatment.
- Clinical presentation in adults can mimic other glomerular diseases, making renal biopsy crucial for accurate diagnosis.
Purpose of the Study:
- To review the epidemiology, clinical presentation, diagnosis, treatment, and outcomes of adult-onset Minimal Change Disease.
- To highlight the differences in presentation and management between pediatric and adult MCD.
- To emphasize the importance of renal biopsy in adult MCD diagnosis.
Main Methods:
- Review of existing literature on Minimal Change Disease in pediatric and adult populations.
- Analysis of clinical features, diagnostic criteria, therapeutic approaches, and long-term outcomes.
- Comparison of treatment response and relapse rates between age groups.
Main Results:
- Adult MCD diagnosis requires renal biopsy due to overlapping clinical features with other nephropathies.
- While remission rates are high (97%) in adults, treatment duration is longer (16-28 weeks) than in children (8 weeks).
- Adults experience frequent relapses (up to 85%), with younger adults (<45 years) relapsing more often, sometimes requiring steroid-sparing agents like cyclophosphamide or cyclosporine.
Conclusions:
- Adult-onset Minimal Change Disease, though less common than in children, has distinct diagnostic and management considerations.
- Despite higher relapse rates, adult MCD generally has an excellent long-term prognosis, with low progression to end-stage renal disease (<5%) and high patient survival (83%-98% at 15 years).
- Timely diagnosis via renal biopsy and appropriate management of relapses are key to favorable outcomes in adult MCD.
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