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Subclinical hyperthyroidism and the risk of coronary heart disease and mortality

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Collet, Tinh-Hai, Gussekloo, Jacobijn, Bauer, Douglas C., den Elzen, Wendy P. J., Cappola, Anne R., Balmer, Philippe, Iervasi, Giorgio, Åsvold, Bjørn O. +17 more·2012·Archives of Internal Medicine

Abstract

BACKGROUND: Data from prospective cohort studies regarding the association between subclinical hyperthyroidism and cardiovascular outcomes are conflicting.We aimed to assess the risks of total and coronary heart disease (CHD) mortality, CHD events, and atrial fibrillation (AF) associated with endogenous subclinical hyperthyroidism among all available large prospective cohorts. METHODS: Individual data on 52 674 participants were pooled from 10 cohorts. Coronary heart disease events were analyzed in 22 437 participants from 6 cohorts with available data, and incident AF was analyzed in 8711 participants from 5 cohorts. Euthyroidism was defined as thyrotropin level between 0.45 and 4.49 mIU/L and endogenous subclinical hyperthyroidism as thyrotropin level lower than 0.45 mIU/L with normal free thyroxine levels, after excluding those receiving thyroid-altering medications. RESULTS: Of 52 674 participants, 2188 (4.2%) had subclinical hyperthyroidism. During follow-up, 8527 participants died (including 1896 from CHD), 3653 of 22 437 had CHD events, and 785 of 8711 developed AF. In age- and sex-adjusted analyses, subclinical hyperthyroidism was associated with increased total mortality (hazard ratio[HR], 1.24, 95% CI, 1.06-1.46), CHD mortality (HR,1.29; 95% CI, 1.02-1.62), CHD events (HR, 1.21; 95%CI, 0.99-1.46), and AF (HR, 1.68; 95% CI, 1.16-2.43).Risks did not differ significantly by age, sex, or preexisting cardiovascular disease and were similar after further adjustment for cardiovascular risk factors, with attributable risk of 14.5% for total mortality to 41.5% forAF in those with subclinical hyperthyroidism. Risks for CHD mortality and AF (but not other outcomes) were higher for thyrotropin level lower than 0.10 mIU/L compared with thyrotropin level between 0.10 and 0.44 mIU/L(for both, P value for trend, .03). CONCLUSION: Endogenous subclinical hyperthyroidism is associated with increased risks of total, CHD mortality, and incident AF, with highest risks of CHD mortality and AF when thyrotropin level is lower than 0.10 mIU/L.

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Crossref · 10.1001/archinternmed.2012.402

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  • Cardiovascular morbidity and mortality are particularly increased in men, in elderly patients with high-normal FT4 levels and in patients with underlying heart disease.

    “Cardiovascular morbidity and mortality are particularly increased in men, in elderly patients with high-normal FT 4 levels and in patients with underlying heart disease [71-73, 76, 77, 87, 91, 92, 94] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [71]

    The Results and Comment sections report that cardiovascular risks associated with subclinical hyperthyroidism did not differ significantly by age, sex, or preexisting cardiovascular disease, contrary to the claimed concentration of risk in those groups. Men had slightly higher estimated risks, but the interaction was not statistically significant. The paper defines subclinical hyperthyroidism using normal FT4 levels; it does not report the claimed elevated risk in elderly patients with high-normal FT4. (LLM, conf=0.88)

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  • The risk of atrial fibrillation in subclinical hyperthyroidism did not differ significantly by sex, age, or pre-existing cardiovascular disease, and was similar after further adjustment for cardiovascular risk factors or pre-existing cardiovascular disease.

    “The risk did not differ significantly by sex, age or pre-existing cardiovascular disease, and was similar after further adjustment for cardiovascular risk factors or pre-existing CVD [71] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [71]

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  • In an individual participant data meta-analysis, the overall hazard ratio for incident atrial fibrillation was higher in participants with subclinical hyperthyroidism than in those who were euthyroid, and the attributable risk for atrial fibrillation was 41.5% in patients with subclinical hyperthyroidism.

    “During a mean follow-up of 8.8 years, the overall HR for incident AF was higher in participants with SHyper than in those who were euthyroid, and the attributable risk for AF was 41.5% in patients with SHyper.”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [71]

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  • Sensitivity analyses excluding patients receiving thyroid medication during follow-up or with previous CVD did not alter the results.

    “Sensitivity analyses excluding patients receiving thyroid medication dur-ing follow-up or with previous CVD did not alter these results.”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [71]

    The Results report that excluding users of thyroxine or antithyroid drugs during follow-up yielded similar hazard ratios. For preexisting CVD, the Methods and Results describe stratified analyses and say risks did not differ significantly by CVD status; they do not describe a sensitivity analysis that excluded those patients. (LLM, conf=0.83)

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  • After age- and sex-adjusted analyses, incident atrial fibrillation was significantly more common in participants with grade 2 subclinical hyperthyroidism (HR 2.54; 95% CI 1.08-5.99) than in those with grade 1 subclinical hyperthyroidism (HR 1.63; 95% CI 1.10-2.41; p for trend 0.02).

    “After age-and sex-adjusted analyses, incident AF was significantly more common in participants with grade 2 SHyper (HR = 2.54; 95% CI: 1.08-5.99)than in those with grade 1 SHyper (HR = 1.63; 95% CI: 1.10-2.41;p for trend 0.02) [71] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [71]

    The Results report the stated age- and sex-adjusted hazard ratios and confidence intervals for incident atrial fibrillation at the two thyrotropin levels, and describe a significant trend toward higher risk at the lower level. They give the trend P value as ≤.03, not the exact .02 claimed. The hazard ratios are for each level relative to euthyroidism, rather than a direct grade 2-versus-grade 1 comparison. (LLM, conf=0.85)

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Authors
Collet, T.-H., Gussekloo, J., Bauer, D. C., den Elzen, W. P. J., Cappola, A. R., Balmer, P., Iervasi, G., Åsvold, B. O., Sgarbi, J. A., Völzke, H., Gencer, B., Maciel, R. M. B., Molinaro, S., Bremner, A., Luben, R. N., Maisonneuve, P., Cornuz, J., Newman, A. B., Khaw, K.-T., Westendorp, R. G. J., Franklyn, J. A., Vittinghoff, E., Walsh, J. P., Rodondi, N., & Thyroid Studies Collaboration, F. T.
Affiliations
  • University of Lausanne (CH)
  • Leiden University (NL)
  • University of California, San Francisco (US)
  • Fondazione Toscana Gabriele Monasterio (IT)
  • Norwegian University of Science and Technology (NO)
  • Governo do Estado de São Paulo (BR)
  • Sir Charles Gairdner Hospital (AU)
  • Universidade Federal de São Paulo (BR)
  • University of Cambridge (GB)
  • European Institute of Oncology (IT)
  • University of Pittsburgh (US)
  • University of Bern (CH)
Corresponding author
Rodondi, Nicolas
Venue
Archives of Internal Medicine
Published
2012-05-28
Volume
172
Issue
10
Pages
799-809
ISSN
0003-9926 (ISSN-L)
OpenAlex
W2113900128
Cited by
572
References
58
Citations by year
2026: 25 · 2025: 23 · 2024: 26 · 2023: 63 · 2022: 41 · 2021: 37 · 2020: 57 · 2019: 35 · 2018: 47 · 2017: 40 · 2016: 43 · 2015: 39 · 2014: 36 · 2013: 38 · 2012: 18
FWCI
33.63
Type
journal article
Language
en
Open access
Locations
  • Archives of Internal Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion)
  • Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Leiden Repository (Leiden University) (submittedVersion)
  • IRIS (submittedVersion)
  • UWA Profiles and Research Repository (UWA) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • BORIS (University Library Bern) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • UNIFESP Institutional Repository (Universidade Federal de São Paulo) (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion, other-oa)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
Funders
  • National Science Foundation
  • American Heart Association
  • University of Pittsburgh (P30-AG024827)
  • Norges Teknisk-Naturvitenskapelige Universitet
  • Cancer Research UK
  • Deutsche Forschungsgemeinschaft
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (15103, 138267, 20098, 320030)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo
  • Bundesministerium für Bildung und Forschung
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek (911-03-016)
  • Universität Greifswald
  • Ministry of Cultural Affairs
  • National Institutes of Health (n01hc085082-026, n01hc085081-021, n01ag062101-007, n01hc085079-024, n01hc085084-005, n01ag062103-006, n01hc085085-011, n01hc085083-027, n01hc085080-026, n01ag062106-007, n01hc085086-022, n01hc55222-0-0-0, n01hc075150-004)
  • Medical Research Council
  • Norwegian Institute of Public Health
  • National Institute on Aging (N01‐AG‐6–2101, R01‐NR012459, N01HC85079, N01 HC‐15103, R01AG028050, NIA grant R01-AG-028050, AG 20098, R56AG023629, AG-15928, R01AG032317, N01HC55222, N01‐HC‐35129, N01-HC-75150, R01AG020098, R01-AG-15928, R01 AG20098, AG023629, AG027058, N01AG62106, HL080295, 024827, N01‐HC‐45133, N01‐HC‐85086, R01AG023629, R01AG015928, N01-AG-62103, R01AG027058, AG-032317, P30AG024827)
  • National Heart, Lung, and Blood Institute (N01-HC-85081, N01HC85085, N01 HC085086, AG-023629, N01HC-85083, AG-027058, R01-NR012459, N01HC15103, N01 HC085079, N01HC85082, N01HC‐75150, N01 HC85086, AG-20098, HL-075366, N01HC85080, N01AG62101, N01HC80007, N01 HC55222, R01HL075366, N01‐HC‐45133, N01AG62106, U01HL080295, N01 HC055222, N01AG62103, AG-15928, N01-HC-85079 through N01-HC-85086, HL080295, N01 HC075150, N01-HC85079, ­N01-HC85084, N01HC35129)
  • National Institute of Nursing Research (N01-AG-6–2101, N01-AG-6-2103, N01-AG-6–2106, R01NR012459)
  • National Institute of Neurological Disorders and Stroke (N01-AG-6-2106, N01-AG-6-2103, AG023629, AG‐15928, AG‐027058, AG‐20098, N01-HC-75150, R01-NR012459, HL080295, N01-HC-35129, N01-HC-45133, N01-AG-6-2101, R01-AG028050, N01-HC-85086, N01 HC-55222, N01HC85079, N01-HC-15103)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (K24AR051895)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
Keywords
subclinical hyperthyroidism, coronary artery disease, mortality, atrial fibrillation, thyroid-stimulating hormone, free thyroxine, cardiovascular risk, attributable risk, thyroid function
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Atrial Fibrillation, Cause of Death, Coronary Artery Disease, Female, Humans, Hyperthyroidism, Male, Middle Aged, Prognosis, Prospective Studies, Severity of Illness Index, Switzerland, Thyroid Function Tests, Thyrotropin, Cohort Studies, Survival Analysis, Age Distribution, Sex Distribution, Risk Assessment, Young Adult

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