Clinical Trial: Effects of Hyperthyroidism on Amount and Activity of Brown Adipose Tissue

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Observational

Official Title: Identification and Regulation of Brown Adipose Tissue (BAT) in Humans. Implications for Energy Expenditure in Humans and in the Treatment of Obesity and Related Metabolic Diseases

Brief Summary:

The investigators wish to evaluate the effect of thyroid hormones on brown adipose tissue in humans in an observational study on patients with thyrotoxicosis. In the investigators evaluation the investigators will use FDG-PET/CT, indirect calorimetry and fat biopsies in the acute phase of the disease and in the euthyroid phase after treatment.

It is the investigators hypothesis that high levels of circulating T3 might affect amount and function of brown adipose tissue.

Detailed Summary: 10 patients with thyreotoxicosis (T3 > 3 nmol/L and suppressed TSH) will be investigated at diagnosis and after 3-6 months of euthyroidism induced by antithyroid treatment. The patients will all be over the age of 50 due to the radiation given by the scans (requested by the local Ethical Committee). All will be scanned for active BAT by the integrated FDG PET-CT before and after treatment.BAT is activated by means of crushed ice placed under the feet in individualized intervals during the scan procedure. Indirect calorimetry is done to determine the basal metabolic rate and subcutaneous fat biopsy to examine the effect on subcutaneous white fat and the possible "browning" effect.
Sponsor: Aarhus University Hospital

Current Primary Outcome: FDG-PET/CT-scanning [ Time Frame: 6 months ]

Original Primary Outcome: Same as current

Current Secondary Outcome: Indirect Calorimetry [ Time Frame: 6 months ]

Original Secondary Outcome: Same as current

Information By: Aarhus University Hospital

Dates:
Date Received: May 5, 2014
Date Started: May 2014
Date Completion: December 2017
Last Updated: January 24, 2017
Last Verified: January 2017