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Bone mineral density and bone turnover in patients with Bartter syndrome

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Abstract

The aim of this investigation was to evaluate bone mineral density (BMD), by use of DXA, and bone turnover, in patients with Bartter syndrome (BS). Ten patients (2 with BS type II and 8 with BS type III) were included in the procedure. Age at study varied between 2 and 30 years. During the studies usual treatment with indomethacin, spironolactone, and potassium chloride was maintained. Results were compared with those obtained in the 20 asymptomatic parents. Height of the patients at the time of the study did not differ from reference values (Z-score −1.2 to +0.8). Three patients (1 with BS type II and 2 with BS type III) presented reduced lumbar spine BMD or overt osteopenia (BMD Z-scores: −2.3, −1.3, and −1.1). BMD did not correlate significantly with age. Paternal and maternal femoral neck BMD values correlated significantly with lumbar spine BMD of the patients (r=0.65, P<0.05, and r=0.80, P<0.01). Lumbar spine BMD Z-scores correlated negatively with urinary Ca excretion when values both from patients and parents were jointly analyzed (r=−0.43, P<0.05). Plasma calcium concentration was significantly higher (P<0.001) and plasma phosphate Z-score was significantly lower (P<0.05) in the patients than in the parents. However, no significant differences were observed in values for intact PTH, 1,25 (OH)2D3 and 25 (OH)D3. Intact PTH values correlated positively with BMD Z-scores at lumbar spine (r=0.45, P<0.05) and at femoral neck (r=0.63, P<0.01). Age-corrected biochemical markers of bone formation (plasma alkaline phosphatase and osteocalcin concentrations) were normal whereas age-corrected markers of bone reabsorption (urinary PYD and DPD excretion) were significantly higher than parental values (P<0.01 and <0.05, respectively). We conclude that: (1) reduced BMD is not an exclusive feature of neonatal BS and it can be also observed in classic BS; (2) the loss of bone mineral is not progressive, probably because of the hypocalciuric effect of indomethacin therapy; and (3) this study did not determine whether loss of bone mass is the cause or the consequence of hypercalciuria although the beneficial effect of indomethacin therapy implies the latter.

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Acknowledgements

We are greatly indebted to Dr Dinna N. Cruz who, when working at Yale University School of Medicine, contributed to the design of the study and helped with the determination of biochemical markers of bone turnover.

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  1. Division of Pediatric Nephrology, Department of Pediatrics, Hospital de Cruces and Basque University School of Medicine, Bilbao, Spain

    Juan Rodríguez-Soriano, Alfredo Vallo & Mireia Aguirre

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  1. Juan Rodríguez-Soriano
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  2. Alfredo Vallo
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  3. Mireia Aguirre
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Correspondence to Juan Rodríguez-Soriano.

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Rodríguez-Soriano, J., Vallo, A. & Aguirre, M. Bone mineral density and bone turnover in patients with Bartter syndrome. Pediatr Nephrol 20, 1120–1125 (2005). https://doi.org/10.1007/s00467-005-1901-1

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