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March 1993

Ketoconazole Decreases the Serum Ionized Calcium and 1,25-Dihydroxyvitamin D Levels in Tuberculosis-Associated Hypercalcemia

Author Affiliations

From the Endocrine Unit, Department of Pediatrics, University of Pisa (Italy).

Am J Dis Child. 1993;147(3):270-273. doi:10.1001/archpedi.1993.02160270032013

• Objective.  —To evaluate whether tuberculosis-associated hypercalcemia is related to abnormal synthesis of 1,25-dihydroxyvitamin D (1,25[OH]2D) and whether ketoconazole administration may be useful in treating tuberculosis-associated hypercalcemia.

Design.  —Case study.

Setting.  —Endocrine Unit, Pediatric Clinic, University of Pisa (Italy).

Participants.  —Two boys (aged 10.5 years and 14.7 years) with active tuberculosis and hypercalcemia.

Measurements/Main Results.  —At admission, serum 1,25-dihydroxyvitamin D levels were elevated. Oral ketoconazole administration (3.0 mg/kg every 8 hours) decreased 1,25-dihydroxyvitamin D levels within the first week of therapy (from 208.8 to 57.6 pmol/L [−72.4%] in one boy and from 321.6 to 115.2 pmol/L [−64.2%] in the other). We also found a coincident normalization of serum ionized calcium concentration (from 1.45 to 1.24 mmol/L [−13.0%] in one boy and from 1.55 to 1.26 mmol/L [−17.0%] in the other).

Conclusions.  —Abnormal elevated levels of 1,25-dihydroxyvitamin D caused hypercalcemia in our patients; ketoconazole administration may be effective in the treatment of hypercalcemia in patients with tuberculosis, which decreases 1,25-dihydroxyvitamin D synthesis.(AJDC. 1993;147:270-273)

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