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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


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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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