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Hereditary nephropathy associated with hyperuricemia and gout
J G Puig1, M E Miranda, F A Mateos
1Division of Internal Medicine, University Hospital, Madrid, Spain.
Archives of Internal Medicine
|February 8, 1993
Summary
Hereditary nephropathy with hyperuricemia involves impaired uric acid excretion, not direct harm from high urate levels. Kidney function declines despite treatment, suggesting primary hemodynamic issues.
Area of Science:
- Nephrology
- Genetics
- Metabolic Disorders
Background:
- Clinical features of hereditary nephropathy linked to hyperuricemia or gout are poorly understood.
- The role of elevated serum urate in the disease's development is debated.
Purpose of the Study:
- To characterize the clinical presentation and purine metabolism in families with hereditary nephropathy and hyperuricemia.
- To investigate the relationship between hyperuricemia, gout, and renal dysfunction in these patients.
Main Methods:
- Clinical assessment and purine metabolism studies (plasma and urine) in 14 patients from two families.
- Comparison with 25 gout patients and 25 healthy controls.
- Longitudinal follow-up (mean 44 months) with allopurinol and enalapril maleate treatments.
Main Results:
- Patients exhibited hyperuricemia, gout, renal insufficiency, hypertension, and reduced kidney size.
- Markedly increased renal vascular resistance and decreased renal plasma flow were observed.
- All patients showed diminished urinary excretion of uric acid, hypoxanthine, and xanthine; Allopurinol worsened renal function.
Conclusions:
- Elevated serum urate in this condition stems from severe uric acid excretion impairment.
- Hyperuricemia is likely a consequence, not a cause, of primary renal hemodynamic disruption.