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[Bartter's syndrome in children and adults. Study of 6 cases]
M Bruno1, A Tricerri, M Manganaro
1Divisione di Nefrologia e Dialisi, Ospedale Mauriziano Umberto I, Torino.
Insights
Bartter's syndrome presents with diverse clinical and biochemical features across pediatric and adult patients. Reduced fractional distal solute reabsorption is not exclusive to this condition.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Clinical Biochemistry
Background:
- Bartter's syndrome is a rare genetic disorder characterized by renal tubulopathy.
- It leads to electrolyte imbalances, including hypokalemia, metabolic alkalosis, and hyperreninemic hyperaldosteronism.
- Understanding the spectrum of clinical presentations and renal handling is crucial for diagnosis and management.
Observation:
- This study presents six patients (3 children, 3 adults) with Bartter's syndrome.
- Pediatric cases showed varied severity, including physical/mental retardation, hypercalciuria, nephrocalcinosis, hypomagnesemia, and high magnesium excretion.
- Adult cases included congenital and acquired forms, with tubular function assessed during maximal diuresis.
Findings:
- Adult patients exhibited defective fractional distal solute reabsorption (FDR) ranging from 0.52 to 0.60.
- This reduced FDR was comparable to patients with interstitial nephropathies and significantly lower than those with psychogenous vomiting.
- The findings suggest Bartter's syndrome encompasses a wide etiopathogenetic spectrum with diverse renal electrolyte handling alterations.
Implications:
- Bartter's syndrome presents with varied clinical manifestations and distinct renal mineral and electrolyte handling abnormalities.
- Reduced fractional distal solute reabsorption is not a definitive diagnostic marker for Bartter's syndrome.
- Further research is needed to elucidate the specific mechanisms underlying the different subtypes and their long-term renal consequences.
Abstract:
Six patients (3 children and 3 adults) with the clinical and biochemical features of Bartter's syndrome are presented. Pediatric cases included a more severe form, in one patient, with physical and mental retardation, hypercalciuria and nephrocalcinosis, and a less severe one, including two patients, with milder clinical features, low calcium and high magnesium excretion and hypomagnesiemia. Adult patients were affected by either the mild congenital form (case n. 4) or the acquired variety (cases n.5 and 6). Tubular function was investigated in the 3 adults by assessing clearance measurements during maximal diuresis. There was a defective fractional distal solute reabsorption (FDR) ranging between 0.52 and 0.60. This was well below the results obtained in one patient with psychogenous vomiting (FDR 0.94) and comparable to those in two patients with interstitial nephropathies caused by vesico-ureteral reflux (FDR 0.63 and 0.67 respectively). We concluded that: 1) the etiopathogenetic spectrum of Bartter's syndrome corresponds to different clinical presentation (mild, heavy, congenital or acquired varieties), and alterations in mineral and electrolyte renal handling; 2) reduction in FDR is a feature neither essential nor exclusive of this syndrome.