The purpose of this study is to assess differential effects of T4 and T3 on cell and tissue level
15-20% of the patients with hypothyroidism remain symptomatic, despite adequate thyroxine substitution. Endocrinologists are split in their opinion on combination therapy with T4 and T3 on patients with poorly regulated hypothyroidism. There are no objective means, by which to identify individuals who would benefit from combination therapy. The purpose of this study is to assess differential effects of T4 and T3 on body temperature, metabolism, muscle strength and brain function. The main aim is to try to identify biomarkers reflecting different effects of T4 and T3 on cell and tissue level.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
69
3 months
3 months
Oslo University Hospital
Oslo, Norway
Brown adipose tissue activation
Thermal imaging of supraclavicular fossa
Time frame: 6 months
Body temperature
Rectal thermometer
Time frame: 6 months
Energy expenditure
Indirect calorimetry
Time frame: 6 months
Muscle strength
Hand grip test
Time frame: 6 months
ThyPRO Questionnaire
Thyroid patient reported outcome, 13 multi-item scale, range 0-100 with higher scores indicating poorer health status
Time frame: 6 months
Mean levels of thyroid hormones
TSH, free T4 and free T3
Time frame: 6 months
SF-36 Questionnaire
Short form health survey, 8 multi-item scale, range 0-100 with higher scores indicating better health status
Time frame: 6 months
Fatigue Questionnaire
11 item, range 0-33 with higher scores implying higher levels of fatigue
Time frame: 6 months
New biomarkers
Bone marrow fat, serum and urine
Time frame: 6 months
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Micro-RNA, miR-92a
Serum exosomes
Time frame: 6 months