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  • Title: Familial distal renal tubular acidosis with neurosensory deafness: early nephrocalcinosis.
    Author: Bentur L, Alon U, Mandel H, Pery M, Berant M.
    Journal: Am J Nephrol; 1989; 9(6):470-4. PubMed ID: 2596537.
    Abstract:
    Nephrocalcinosis was observed in 3 children of one family with distal renal tubular acidosis (dRTA). At presentation, all 3 patients had failure to thrive, rickets, hyperchloremic metabolic acidosis, hypokalemia, hypophosphatemia and hypercalciuria. At a later age, sensorineural hearing impairment was detected. Nephrocalcinosis was diagnosed in the index case at the age of 5 years, when a plain abdominal roentgenogram was first made; in the younger brother and sister, nephrocalcinosis was detected earlier at the age of 4 months and 5 weeks, respectively. All 3 patients required large doses of alkali (7.5-9.5 mEq/kg body weight/day) during infancy and early childhood to correct the acidosis and to prevent progression of the nephrocalcinosis. Contrary to the current notion that in children with dRTA, nephrocalcinosis is observed only after the age of 3 years, it appears that in some instances nephrocalcinosis may develop in early infancy. The occurrence of nephrocalcinosis at a very young age may be a manifestation of a severe genetically transmitted variant of dRTA and emphasizes the need for early diagnosis and optimal treatment of these patients from the first days of life.
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