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04 June 2015 : Clinical Research  

Functional Status of Thyroid and Cognitive Functions after Menopause

Iwona BojarABCDEFG, Alfred OwocADEG, Mariusz GujskiADEG, Mariusz WitczakABCD, Maciej GnatowskiDF, Irena WaleckaADEFG

DOI: 10.12659/MSM.892880

Med Sci Monit 2015; 21:1625-1633

Abstract

BACKGROUND: Thyroid activity plays a role in cognition. However, the relation between the functional state of thyroid and neuropsychiatric changes proceeding with age among people without clinical symptoms of thyroid dysfunction is still unknown. The aim of this study was analysis of cognitive function levels in reference to thyroid examination: thyroid-stimulating hormone (TSH), total thyroxin (TT4), triiodothyronine (TT3), free thyroxin (FT4), free triiodothyronine (FT3), thyroperoxidase antibodies (TPO-AB), and thyroglobulin antibodies (Tg-AB), TSH receptor antibodies (AB-TSHR) in women after menopause.

MATERIAL AND METHODS: A group of 383 women was recruited for the study. The inclusion criteria were: minimum two years after the last menstruation and no dementia signs on Montreal Cognitive Assessment (MoCA). Computerized battery of Central Nervous System Vital Signs (CNS VS) test was used to diagnostic cognitive functions. The blood plasma values were determined: TSH, FT3, FT4, TT3, TT4, TPO-AB, Tg-AB, and AB-TSHR. Statistical analysis was performed using Pearson’s correlation coefficient and analysis of variance in STATISTICA software.

RESULTS: In women after menopause, TSH was negatively correlated with NCI results, executive functions, complex attention, and cognitive flexibility. FT4 was positively correlated with results of psychomotor speed. TT3 and TT4 were negatively correlated with results of memory and verbal memory. Furthermore, TT4 was negatively correlated with NCI, executive functions, and cognitive flexibility. TPO-AB was negatively correlated with results of memory, verbal memory, and psychomotor speed. Tg-AB was positively correlated with results of reaction time. AB-TSHR was negatively correlated with NCI results, memory, executive functions, psychomotor speed, complex attention, and cognitive flexibility.

CONCLUSIONS: Our study supports the importance of thyroid functionality in cognitive functioning in a group of women after menopause. The values of TSH, TT3, TT4, TPO-AB, and AB-TSHR were higher and FT4 was lower in examined women. The results were poorer in examination of cognitive functions measured with a battery of CNS-VS tests.

Keywords: Attention - physiology, Analysis of Variance, Cognition - physiology, Executive Function - physiology, Menopause - physiology, Neuropsychological Tests, Poland, Psychomotor Performance - physiology, Thyroid Gland - physiology, Thyrotropin - blood, Thyroxine - blood, Triiodothyronine - blood

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750