Subclinical thyroid dysfunction and cardiovascular outcomes among prospective cohort studies

Gencer, Baris; Collet, Tinh-Hai; Virgini, Vanessa; Auer, Reto; Rodondi, Nicolas (2013). Subclinical thyroid dysfunction and cardiovascular outcomes among prospective cohort studies. Endocrine, metabolic & immune disorders drug targets, 13(1), pp. 4-12. Bentham Science

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The association between subclinical thyroid dysfunction and cardiovascular outcomes has been recently clarified with the publication of three individual participant data (IPD) analyses from the Thyroid Studies Collaboration. We identified original cohort studies with a systematic review and pooled individual data from over 70'000 participants to obtain a more precise estimate of the risks of cardiovascular outcomes associated with subclinical thyroid dysfunction. Subclinical hypothyroidism and subclinical hyperthyroidism, defined as normal thyroxine (FT4) levels with increased or decreased Thyroid-Stimulating Hormones (TSH or thyrotropin) respectively, are associated with increased risk of cardiovascular outcomes compared to euthyroid state, particularly in those with a more pronounced thyroid dysfunction. Specifically, subclinical hypothyroidism is associated with an increased risk of coronary heart disease (CHD) events, CHD mortality and heart failure (HF) events in individuals with higher TSH levels, particularly in those with TSH levels ≥10.0 mIU/L. Conversely, subclinical hyperthyroidism is associated with an increased risk of total mortality, CHD mortality, HF and atrial fibrillation, particularly in those with suppressed TSH levels <0.10 mIU/L. Pending ongoing randomized controlled trials, these observational findings allow identifying potential TSH thresholds for thyroid medication initiation based on risk of clinical outcomes, although clinical decision based solely on observational data need caution. The impact of thyroid replacement among the elderly with subclinical hypothyroidism is currently studied in a multicenter international randomized controlled trial (Thyroid Hormone Replacement for Subclinical Hypothyroidism Trial, TRUST trial).

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of General Internal Medicine (DAIM) > Clinic of General Internal Medicine > Centre of Competence for General Internal Medicine
04 Faculty of Medicine > Department of General Internal Medicine (DAIM) > Clinic of General Internal Medicine

UniBE Contributor:

Virgini, Vanessa and Rodondi, Nicolas

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2212-3873

Publisher:

Bentham Science

Language:

English

Submitter:

Patricia Rajaonina

Date Deposited:

01 Apr 2014 09:01

Last Modified:

01 Apr 2014 09:01

PubMed ID:

23369133

URI:

https://boris.unibe.ch/id/eprint/42430

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