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Effects of Hyperthyroidism on Amount and Activity of Brown Adipose Tissue

Information source: Aarhus University Hospital
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Hyperthyroidism

Phase: N/A

Status: Recruiting

Sponsored by: Aarhus University Hospital

Official(s) and/or principal investigator(s):
Bjørn Richelsen, Professor, Study Director, Affiliation: University of Aarhus

Overall contact:
Peter Breining, MD, Phone: +45 78467163, Email: peter.breining@ki.au.dk

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.

Clinical Details

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

Study design: Observational Model: Case-Only, Time Perspective: Prospective

Primary outcome: FDG-PET/CT-scanning

Secondary outcome: Indirect Calorimetry

Detailed description: 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.

Eligibility

Minimum age: 50 Years. Maximum age: N/A. Gender(s): Both.

Criteria:

Inclusion Criteria:

- men and women with hyperthyroidism (T3 > 3 nmol/l)

- > 50 years old

- women must be postmenopausal

Exclusion Criteria:

- thyrotoxic crises

- severe concurrent sickness that will make it unsafe to postpone treatment, this

includes severe kidney disease (creatinin over 160)- and heart disease (NYHA group 3 and 4).

- diabetes

- former and current treatment with interleukin-2

- Patients who are already treated with β-blockers

- severe claustrophobia

- BMI > 30 kg/m2

Locations and Contacts

Peter Breining, MD, Phone: +45 78467163, Email: peter.breining@ki.au.dk

Aarhus University Hospital, Aarhus, Region Midtjylland 8000, Denmark; Recruiting
Peter Breining, MD, Phone: +45 78457163, Email: peter.breining@ki.au.dk
Lene Plagborg, Secretary, Phone: +45 7846 7696, Email: leneplag@rm.dk
Additional Information

Starting date: May 2014
Last updated: January 13, 2015

Page last updated: August 23, 2015

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