Study protocol; thyroid hormone replacement for untreated older adults with subclinical hypothyroidism - a randomised placebo controlled trial (TRUST)

Stott, D. J. et al. (2017) Study protocol; thyroid hormone replacement for untreated older adults with subclinical hypothyroidism - a randomised placebo controlled trial (TRUST). BMC Endocrine Disorders, 17, 6. (doi:10.1186/s12902-017-0156-8) (PMID:28158982) (PMCID:PMC5291970)

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Abstract

Background: Subclinical hypothyroidism (SCH) is a common condition in elderly people, defined as elevated serum thyroid-stimulating hormone (TSH) with normal circulating free thyroxine (fT4). Evidence is lacking about the effect of thyroid hormone treatment. We describe the protocol of a large randomised controlled trial (RCT) of Levothyroxine treatment for SCH. Methods: Participants are community-dwelling subjects aged ≥65 years with SCH, diagnosed by elevated TSH levels (≥4.6 and ≤19.9 mU/L) on a minimum of two measures ≥ three months apart, with fT4 levels within laboratory reference range. The study is a randomised double-blind placebo-controlled parallel group trial, starting with levothyroxine 50 micrograms daily (25 micrograms in subjects <50Kg body weight or known coronary heart disease) with titration of dose in the active treatment group according to TSH level, and a mock titration in the placebo group. The primary outcomes are changes in two domains (hypothyroid symptoms and fatigue / vitality) on the thyroid-related quality of life questionnaire (ThyPRO) at one year. The study has 80% power (at p = 0.025, 2-tailed) to detect a change with levothyroxine treatment of 3.0% on the hypothyroid scale and 4.1% on the fatigue / vitality scale with a total target sample size of 750 patients. Secondary outcomes include general health-related quality of life (EuroQol), fatal and non-fatal cardiovascular events, handgrip strength, executive cognitive function (Letter Digit Coding Test), basic and instrumental activities of daily living, haemoglobin, blood pressure, weight, body mass index and waist circumference. Patients are monitored for specific adverse events of interest including incident atrial fibrillation, heart failure and bone fracture. Discussion: This large multicentre RCT of levothyroxine treatment of subclinical hypothyroidism is powered to detect clinically relevant change in symptoms / quality of life and is likely to be highly influential in guiding treatment of this common condition. Trial registration: Clinicaltrials.gov NCT01660126; registered 8th June 2012.

Item Type:Articles
Additional Information:The study was supported by a research grant from the European Union FP7- HEALTH-2011 programme - Investigator-driven clinical trials for therapeutic interventions in elderly populations. Grant agreement number 278148.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kean, Ms Sharon and Stott, Professor David J and Ford, Professor Ian and Poortvliet, Dr Rosalinde and Hendry, Miss Kirsty and Quinn, Dr Terence and Sattar, Professor Naveed
Authors: Stott, D. J., Gussekloo, J., Kearney, P. M., Rodondi, N., Westendorp, R. G.J., Mooijaart, S., Kean, S., Quinn, T. J., Sattar, N., Hendry, K., Du Puy, R., Den Elzen, W. P.J., Poortvliet, R. K.E., Smit, J. W.A., Jukema, J. W., Dekkers, O. M., Blum, M., Collet, T.-H., McCarthy, V., Hurley, C., Byrne, S., Browne, J., Watt, T., Bauer, D., and Ford, I.
Subjects:R Medicine > R Medicine (General)
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > Robertson Centre
Journal Name:BMC Endocrine Disorders
Publisher:BioMed Central
ISSN:1472-6823
ISSN (Online):1472-6823
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in BMC Endocrine Disorders 17: 6
Publisher Policy:Reproduced under a Creative Commons License

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