Abstract
The unusual coincidence of Bartter syndrome and C1q nephropathy is described and the literature reviewed. An African-American girl presented at 4 years of age with acute hyponatremic dehydration and failure to thrive. Persistent hypokalemic alkalosis and secondary hyperaldosteronism were found. The case was atypical for Bartter syndrome in that proteinuria (0.19 g/day) was present. Renal biopsy showed juxtaglomerular hyperplasia and C1q nephropathy. Molecular analysis showed deletion of the renal chloride channel gene (CLCNKB) typical of autosomal recessive childhood Bartter syndrome. Chronic sodium and potassium chloride replacement therapy together with indomethacin normalized her metabolic status, and she experienced catch-up growth. Proteinuria persisted, however. This is the first documentation of C1q nephropathy, in mild form, complicating autosomal recessive Bartter syndrome. This case shows the importance of the renal biopsy and of molecular analysis in delineating the cause of atypical nephropathy associated with Bartter syndrome. These findings add to the evidence of a possible association between the congenital syndrome and acquired immune complex nephropathy.
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Acknowledgements
Dr. Rosenfield's research is supported in part by the University of Chicago General Clinical Research Center (USPHS RR-00055). We thank Connie Robinson, RN, for her help in data collection.
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Sardani, Y., Qin, K., Haas, M. et al. Bartter syndrome complicated by immune complex nephropathy. Pediatr Nephrol 18, 913–918 (2003). https://doi.org/10.1007/s00467-003-1194-1
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DOI: https://doi.org/10.1007/s00467-003-1194-1