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Minerva Endocrinologica 2008 March;33(1):7-13


language: English

High-calcium mineral water as a calcium supplementing measure for post-thyroidectomy hypocalcemia

Coiro V. 1, Zanardi G. 1, Saccani Jotti G. 2, Rubino P. 1, Manfredi G. 1, Chiodera P. 3

1 Department of Internal Medicine and Biomedical Sciences, University of Parma, Parma, Italy 2 Department of Public Health, University of Parma, Parma, Italy 3 Graduate School in Physical Exercise and Sport Sciences, University of Parma, Parma, Italy


Aim. The aim of this study was to test the possibility of enhancing blood calcium levels in totally thyroidectomized patients by supplementation with 1 L/d carbonate-bicarbonate-high-calcium mineral water.
Methods. This study enrolled 95 outpatients, totally thyroidectomized four months earlier, and hence treated with oral calcium and vitamin-D. At recruitment, ionized blood calcium was either below (Group A; N. 55) or above (Group B; N. 40, randomly divided in Group B1 [N. 20] and Group B2 [N.20]) the lower limit of the normal range (1.12 mmol/L). For one month, Group A was treated with 1 L/d high-calcium (483 mg/L) mineral water and continued the usual therapy with Ca and vitamin-D. In contrast, Group B1 and Group B2 substituted their Ca and vitamin-D therapy with 1 L/d high-calcium mineral water (Group B1) or 1 L/d of placebo mineral water (Ca:80mg/L) (Group B2).
Results. After one month, a significant 7.5% increase in blood ionized-calcium levels was observed in Group A, no change in Group B1 and a significant drop below normality in Group B2 (Group B2 vs Group B1, P<0.001). Thereafter, 1 L/d of the high-calcium mineral water, given to Group B2 instead of placebo for an additional month, significantly enhanced ionized-calcium levels above the lower limit of normality (Group B2 vs Group B1, NS).
Conclusion. These experiments show that calcium supplementation as 1 L/d of a high-calcium mineral water may efficaciously enhance blood calcium levels in thyroidectomized patients. This complementary treatment might at least in part contribute to the prevention and/or treatment of hypocalcemia and substitute vitamin-D and calcium therapies after thyroidectomy.

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