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[The Bartter-like syndrome in 2 twins]
G Ruffa1, M A Vigliarolo, P Sbolgi
1Istituto Giannina Gaslini, Università degli Studi di Genova.
Minerva Pediatrica
|July 1, 1993
Summary
This case study describes two twins with poor growth who exhibited symptoms of both Bartter syndrome and Gitelman syndrome. A "Bartter-like syndrome" diagnosis was proposed due to their unique combination of clinical and biochemical features.
Area of Science:
- Pediatric Endocrinology
- Renal Medicine
- Genetics
Background:
- Genetic renal tubulopathies, such as Bartter syndrome and Gitelman syndrome, are characterized by specific electrolyte and acid-base disturbances.
- Early diagnosis and management are crucial for preventing long-term complications, including growth impairment.
Observation:
- Two 9-year-old twins presented with poor stature and ponderal growth.
- Biochemical analysis revealed hypokalemia, hypomagnesemia, metabolic alkalosis, elevated renin, normal aldosterone, and hypocalciuria, with normal blood pressure.
- Tubular function tests indicated decreased chloride resorption.
Findings:
- The twins displayed a mix of features from Bartter syndrome (e.g., hypokalemia, metabolic alkalosis, elevated renin, decreased chloride resorption) and Gitelman syndrome (e.g., late onset, hypomagnesemia, hypocalciuria).
- Fractionated tubular resorption values of chlorides were identified during induced diuresis.
- The clinical presentation and biochemical anomalies did not perfectly align with either classic syndrome.
Implications:
- The designation "Bartter-like syndrome" is suggested to encompass the observed complex phenotype in these patients.
- This case highlights the diagnostic challenges in differentiating overlapping genetic renal tubular disorders.
- Further research into the genetic basis of such overlapping syndromes may refine diagnostic criteria and therapeutic strategies.