open access
Homocysteine, folate, and cobalamin levels in hyperthyroid women before and after treatment
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Abstract
Introduction: Hyperhomocysteinaemia is an independent risk factor for premature atherosclerotic vascular disease and venous thrombosis. Hypothyroidism is associated with mild hyperhomocysteinaemia. The aim of the present study was to assess plasma total homocysteine (tHcy) and its determinants (folate, cobalamin) in hyperthyroid patients before and after treatment.
Material and methods: Thirty hyperthyroid and thirty healthy premenopausal women were studied. The hyperthyroid patients were investigated in the untreated state and again after restoration of euthyroidism. The levels of homocysteine, folate, cobalamin, and thyroid stimulating hormone (TSH), free thyroxine (fT4), free triiodothyronine (fT3), and renal function were measured before and after treatment.
Results: In hyperthyroidism, tHcy was lower than in the control group. The serum level of folate was higher and serum cobalamin was lower in the hyperthyroid state. Following antithyroid drug therapy, tHcy significantly increased and folate decreased. The level of cobalamin remained unchanged. Univariate analysis in the hyperthyroid group indicated that tHcy significantly negatively correlated only with fT3.
Conclusions: Lower homocysteine levels in hyperthyroid state can be explained by the influence of thyroid hormone. High level of folate is only partially responsible for these changes.
Abstract
Introduction: Hyperhomocysteinaemia is an independent risk factor for premature atherosclerotic vascular disease and venous thrombosis. Hypothyroidism is associated with mild hyperhomocysteinaemia. The aim of the present study was to assess plasma total homocysteine (tHcy) and its determinants (folate, cobalamin) in hyperthyroid patients before and after treatment.
Material and methods: Thirty hyperthyroid and thirty healthy premenopausal women were studied. The hyperthyroid patients were investigated in the untreated state and again after restoration of euthyroidism. The levels of homocysteine, folate, cobalamin, and thyroid stimulating hormone (TSH), free thyroxine (fT4), free triiodothyronine (fT3), and renal function were measured before and after treatment.
Results: In hyperthyroidism, tHcy was lower than in the control group. The serum level of folate was higher and serum cobalamin was lower in the hyperthyroid state. Following antithyroid drug therapy, tHcy significantly increased and folate decreased. The level of cobalamin remained unchanged. Univariate analysis in the hyperthyroid group indicated that tHcy significantly negatively correlated only with fT3.
Conclusions: Lower homocysteine levels in hyperthyroid state can be explained by the influence of thyroid hormone. High level of folate is only partially responsible for these changes.
Keywords
homocysteine; cobalamin; folate; hyperthyroidism
About this articleTitle
Homocysteine, folate, and cobalamin levels in hyperthyroid women before and after treatment
Journal
Issue
Article type
Original paper
Pages
443-448
Published online
2009-12-30
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787
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1739
Bibliographic record
Endokrynol Pol 2009;60(6):443-448.
Keywords
homocysteine
cobalamin
folate
hyperthyroidism
Authors
Anna Orzechowska-Pawilojc
Małgorzata Siekierska-Hellmann
Anhelli Syrenicz
Krzysztof Sworczak
