Thyroid Hormones Effect on Brown Adipose Tissue

Fudan University

Status

Unknown

Conditions

Hyperthyroidism

Study type

Observational

Funder types

Other

Identifiers

NCT01376648

KY2009-257

Details and patient eligibility

About

Brown adipose tissue (BAT) is important in energy expenditure through thermogenesis although the regulatory factors are not well known in humans. There is evidence suggesting that the thyroid hormones affect BAT functions in lower mammals, but the effects of the thyroid hormones on BAT activity in humans are still unclear. The objective of this study was to investigate the effects of thyroid hormones on glucose metabolism of BAT and other organs in humans.

Full description

Twenty consecutive patients with Graves'-caused hyperthyroidism who are newly diagnosed and untreated will be studied at the Endocrine Department of Huashan Hospital, Fudan University. All subjects are screened and examined by two senior investigators. Putative BAT activity is determined by the integrated 18F-fluorodeoxyglucose (18F-FDG) PET-CT. After the first PET scan, hyperthyroid patients will be treated with Methimazole following clinical guidelines. None of them uses beta adrenergic blockade. The initial dose of methimazole employed is 10mg thrice a day. During follow-up, the thyroid hormone levels (free triiodothyronine and free thyroxine) will be measured every twenty days. The PET-CT scans and assessments will be repeated when the symptoms have disappeared and the thyroid hormone levels return to normal range. Then the dose of methimazole will be adjusted accordingly.

Enrollment

20 estimated patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria