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Lookup NU author(s): Professor Simon PearceORCiD, Dr Salman Razvi, Mohammad Yadegarfar, Dr Carmen Martin-RuizORCiD, Dr Andrew KingstonORCiD, Dr Joanna Collerton, Emeritus Professor Thomas Kirkwood, Emerita Professor Carol Jagger
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Context: Perturbations in thyroid function are common in older individuals but their significance in the very old is not fully understood.Objective: This study sought to determine whether thyroid hormone status and variation of thyroid hormones within the reference range correlated with mortality and disability in a cohort of 85-year-olds.Design: A cohort of 85-year-old individuals were assessed in their own homes (community or institutional care) for health status and thyroid function, and followed for mortality and disability for up to 9 years.Setting and Participants: Six hundred and forty-three 85-year-olds registered with participating general practices in Newcastle and North Tyneside, United Kingdom.Main Outcomes: All-cause mortality, cardiovascular mortality, and disability according to thyroid disease status and baseline thyroid hormone parameters (serum TSH, FT4, FT3, and rT(3)). Models were adjusted for age, sex, education, body mass index, smoking, and disease count.Results: After adjustment for age and sex, all-cause mortality was associated with baseline serum rT(3) and FT3 (both P < .001), but not FT, or TSH. After additional adjustment for potential confounders, only rT(3) remained significantly associated with mortality (P =.001). Baseline serum TSH and rT(3) predicted future disability trajectories in men and women, respectively.Conclusions: Our study is reassuring that individuals age 85 y with both subclinical hypothyroidism and subclinical hyperthyroidism do not have a significantly worse survival over 9 years than their euthyroid peers. However, thyroid function tests did predict disability, with higher serum TSH levels predicting better outcomes. These data strengthen the argument for routine use of age-specific thyroid function reference ranges.
Author(s): Pearce SHS, Razvi S, Yadegarfar ME, Martin-Ruiz C, Kingston A, Collerton J, Visser TJ, Kirkwood TB, Jagger C
Publication type: Article
Publication status: Published
Journal: Journal of Clinical Endocrinology & Metabolism
Year: 2016
Volume: 101
Issue: 11
Pages: 4385-4394
Print publication date: 01/11/2016
Online publication date: 23/08/2016
Acceptance date: 17/08/2016
Date deposited: 13/04/2017
ISSN (print): 0021-972X
ISSN (electronic): 1945-7197
Publisher: Endocrine Society
URL: http://dx.doi.org/10.1210/jc.2016-1935
DOI: 10.1210/jc.2016-1935
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