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Thiazide-lnduced Rise in Serum Calcium and Magnesium in Patients on Maintenance Hemodialysis
- MARCELO H. KOPPEL, M.D.;
- SHAUL G. MASSRY, M.D.;
- JAMES H. SHINABERGER, M.D.;
- DAVID L. HARTENBOWER, M.D.; and
- JACK W. COBURN, M.D., F.A.C.P.
Abstract
Hydrochlorothiazide, 200 mg/day, was given orally for 2 to 4 weeks to 14 patients treated with maintenance hemodialysis for end-stage renal disease. Predialysis levels of serum calcium rose in 13 patients, and distinct hypercalcemia developed in 8 patients. Changes in serum levels of diffusible calcium paralleled those of total calcium concentrations. Predialysis levels of serum magnesium also rose during thiazide administration. The infusion of parathyroid extract, 1 unit/hr/kg of body weight for 10 hr, failed to ellcit a normal increase in serum calcium in most of the uremic patients who had a calcemic response to thiazides. These data demonstrate an extrarenal effect of thiazides on calcium and magnesium metabolism. It is proposed that the calcemic effect of thiazides in these patients may be due to potentiation of the action of parathyroid hormone on bone.
Article and Author Information
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▸From the Research and Medical Services, Wadsworth Hospital, Los Angeles Veterans Administration Center; and the Departments of Medicine, Cedars-Sinai Medical Center and UCLA School of Medicine; Los Angeles, Calif.
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Supported in part by Public Health Service contract 43-68-1040 and by training grant TI AM 5383, U.S. Public Health Service, Washington, D.C.
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Drs. Koppel and Hartenbower are Research and Education Associates of the Veterans Administration; Dr. Massry is an Established Investigator of the American Heart Association, New York, N. Y.
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▸Requests for reprints should be addressed to Marcelo H. Koppel, M.D., Veterans Administration Center, Wilshire & Sawtelle Blvds., Los Angeles, Calif. 90073
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- Received December 15, 1969.
- Accepted February 13, 1970.
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