Thyroid Function Within the Normal Range, Subclinical Hypothyroidism, and the Risk of Atrial Fibrillation

Atrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may yield opportunities for prevention. The risk of AF is increased in subclinical hyperthyroidism, but it is uncertain whether variations in thyroid...

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Published inCirculation (New York, N.Y.) Vol. 136; no. 22; pp. 2100 - 2116
Main Authors Baumgartner, Christine, da Costa, Bruno R., Collet, Tinh-Hai, Feller, Martin, Floriani, Carmen, Bauer, Douglas C., Cappola, Anne R., Heckbert, Susan R., Ceresini, Graziano, Gussekloo, Jacobijn, den Elzen, Wendy P.J., Peeters, Robin P., Luben, Robert, Völzke, Henry, Dörr, Marcus, Walsh, John P., Bremner, Alexandra, Iacoviello, Massimo, Macfarlane, Peter, Heeringa, Jan, Stott, David J., Westendorp, Rudi G. J., Khaw, Kay-Tee, Magnani, Jared W., Aujesky, Drahomir, Rodondi, Nicolas
Format Journal Article
LanguageEnglish
Published United States 28.11.2017
Subjects
Online AccessGet full text
ISSN0009-7322
1524-4539
1524-4539
DOI10.1161/CIRCULATIONAHA.117.028753

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Abstract Atrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may yield opportunities for prevention. The risk of AF is increased in subclinical hyperthyroidism, but it is uncertain whether variations in thyroid function within the normal range or subclinical hypothyroidism are also associated with AF. We conducted a systematic review and obtained individual participant data from prospective cohort studies that measured thyroid function at baseline and assessed incident AF. Studies were identified from MEDLINE and EMBASE databases from inception to July 27, 2016. The euthyroid state was defined as thyroid-stimulating hormone (TSH) 0.45 to 4.49 mIU/L, and subclinical hypothyroidism as TSH 4.5 to 19.9 mIU/L with free thyroxine (fT4) levels within reference range. The association of TSH levels in the euthyroid and subclinical hypothyroid range with incident AF was examined by using Cox proportional hazards models. In euthyroid participants, we additionally examined the association between fT4 levels and incident AF. Of 30 085 participants from 11 cohorts (278 955 person-years of follow-up), 1958 (6.5%) had subclinical hypothyroidism and 2574 individuals (8.6%) developed AF during follow-up. TSH at baseline was not significantly associated with incident AF in euthyroid participants or those with subclinical hypothyroidism. Higher fT4 levels at baseline in euthyroid individuals were associated with increased AF risk in age- and sex-adjusted analyses (hazard ratio, 1.45; 95% confidence interval, 1.26-1.66, for the highest quartile versus the lowest quartile of fT4; for trend ≤0.001 across quartiles). Estimates did not substantially differ after further adjustment for preexisting cardiovascular disease. In euthyroid individuals, higher circulating fT4 levels, but not TSH levels, are associated with increased risk of incident AF.
AbstractList Atrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may yield opportunities for prevention. The risk of AF is increased in subclinical hyperthyroidism, but it is uncertain whether variations in thyroid function within the normal range or subclinical hypothyroidism are also associated with AF. We conducted a systematic review and obtained individual participant data from prospective cohort studies that measured thyroid function at baseline and assessed incident AF. Studies were identified from MEDLINE and EMBASE databases from inception to July 27, 2016. The euthyroid state was defined as thyroid-stimulating hormone (TSH) 0.45 to 4.49 mIU/L, and subclinical hypothyroidism as TSH 4.5 to 19.9 mIU/L with free thyroxine (fT4) levels within reference range. The association of TSH levels in the euthyroid and subclinical hypothyroid range with incident AF was examined by using Cox proportional hazards models. In euthyroid participants, we additionally examined the association between fT4 levels and incident AF. Of 30 085 participants from 11 cohorts (278 955 person-years of follow-up), 1958 (6.5%) had subclinical hypothyroidism and 2574 individuals (8.6%) developed AF during follow-up. TSH at baseline was not significantly associated with incident AF in euthyroid participants or those with subclinical hypothyroidism. Higher fT4 levels at baseline in euthyroid individuals were associated with increased AF risk in age- and sex-adjusted analyses (hazard ratio, 1.45; 95% confidence interval, 1.26-1.66, for the highest quartile versus the lowest quartile of fT4; for trend ≤0.001 across quartiles). Estimates did not substantially differ after further adjustment for preexisting cardiovascular disease. In euthyroid individuals, higher circulating fT4 levels, but not TSH levels, are associated with increased risk of incident AF.
Atrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may yield opportunities for prevention. The risk of AF is increased in subclinical hyperthyroidism, but it is uncertain whether variations in thyroid function within the normal range or subclinical hypothyroidism are also associated with AF.BACKGROUNDAtrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may yield opportunities for prevention. The risk of AF is increased in subclinical hyperthyroidism, but it is uncertain whether variations in thyroid function within the normal range or subclinical hypothyroidism are also associated with AF.We conducted a systematic review and obtained individual participant data from prospective cohort studies that measured thyroid function at baseline and assessed incident AF. Studies were identified from MEDLINE and EMBASE databases from inception to July 27, 2016. The euthyroid state was defined as thyroid-stimulating hormone (TSH) 0.45 to 4.49 mIU/L, and subclinical hypothyroidism as TSH 4.5 to 19.9 mIU/L with free thyroxine (fT4) levels within reference range. The association of TSH levels in the euthyroid and subclinical hypothyroid range with incident AF was examined by using Cox proportional hazards models. In euthyroid participants, we additionally examined the association between fT4 levels and incident AF.METHODSWe conducted a systematic review and obtained individual participant data from prospective cohort studies that measured thyroid function at baseline and assessed incident AF. Studies were identified from MEDLINE and EMBASE databases from inception to July 27, 2016. The euthyroid state was defined as thyroid-stimulating hormone (TSH) 0.45 to 4.49 mIU/L, and subclinical hypothyroidism as TSH 4.5 to 19.9 mIU/L with free thyroxine (fT4) levels within reference range. The association of TSH levels in the euthyroid and subclinical hypothyroid range with incident AF was examined by using Cox proportional hazards models. In euthyroid participants, we additionally examined the association between fT4 levels and incident AF.Of 30 085 participants from 11 cohorts (278 955 person-years of follow-up), 1958 (6.5%) had subclinical hypothyroidism and 2574 individuals (8.6%) developed AF during follow-up. TSH at baseline was not significantly associated with incident AF in euthyroid participants or those with subclinical hypothyroidism. Higher fT4 levels at baseline in euthyroid individuals were associated with increased AF risk in age- and sex-adjusted analyses (hazard ratio, 1.45; 95% confidence interval, 1.26-1.66, for the highest quartile versus the lowest quartile of fT4; P for trend ≤0.001 across quartiles). Estimates did not substantially differ after further adjustment for preexisting cardiovascular disease.RESULTSOf 30 085 participants from 11 cohorts (278 955 person-years of follow-up), 1958 (6.5%) had subclinical hypothyroidism and 2574 individuals (8.6%) developed AF during follow-up. TSH at baseline was not significantly associated with incident AF in euthyroid participants or those with subclinical hypothyroidism. Higher fT4 levels at baseline in euthyroid individuals were associated with increased AF risk in age- and sex-adjusted analyses (hazard ratio, 1.45; 95% confidence interval, 1.26-1.66, for the highest quartile versus the lowest quartile of fT4; P for trend ≤0.001 across quartiles). Estimates did not substantially differ after further adjustment for preexisting cardiovascular disease.In euthyroid individuals, higher circulating fT4 levels, but not TSH levels, are associated with increased risk of incident AF.CONCLUSIONSIn euthyroid individuals, higher circulating fT4 levels, but not TSH levels, are associated with increased risk of incident AF.
Author Collet, Tinh-Hai
Bauer, Douglas C.
Westendorp, Rudi G. J.
Gussekloo, Jacobijn
da Costa, Bruno R.
Völzke, Henry
Floriani, Carmen
Cappola, Anne R.
Heeringa, Jan
Aujesky, Drahomir
Ceresini, Graziano
Peeters, Robin P.
Khaw, Kay-Tee
Walsh, John P.
Baumgartner, Christine
Rodondi, Nicolas
Bremner, Alexandra
Dörr, Marcus
den Elzen, Wendy P.J.
Macfarlane, Peter
Magnani, Jared W.
Luben, Robert
Stott, David J.
Heckbert, Susan R.
Iacoviello, Massimo
Feller, Martin
AuthorAffiliation 20 Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
19 Department of Epidemiology and Biostatistics, Erasmus Medical Center, Rotterdam, The Netherlands
16 School of Population Health, University of Western Australia, Crawley, WA, Australia
8 Department of Public Health and Primary Care, and Department of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, The Netherlands
18 Institute of Health and Wellbeing, University of Glasgow, Glasgow, United Kingdom
2 Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
10 Departments of Internal Medicine and Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
22 Heart and Vascular Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, United States
9 Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
15 Department of Endocrinology & Diabetes, Sir Charles Gairdner Ho
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– name: 9 Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
– name: 13 Department of Internal Medicine, University Medicine Greifswald, Greifswald, Germany and German Centre for Cardiovascular Research (DZHK), partner site Greifswald, Greifswald, Germany
– name: 14 School of Medicine and Pharmacology, University of Western Australia, Crawley, WA, Australia
– name: 18 Institute of Health and Wellbeing, University of Glasgow, Glasgow, United Kingdom
– name: 21 Department of Public Health and Center for Healthy Ageing, University of Copenhagen, Copenhagen, Denmark
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– name: 11 Department of Public Health and Primary Care, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom
– name: 6 Department of Epidemiology, University of Washington, Seattle, WA, United States
– name: 1 Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
– name: 2 Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland
– name: 17 Cardiology Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
– name: 19 Department of Epidemiology and Biostatistics, Erasmus Medical Center, Rotterdam, The Netherlands
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/29061566$$D View this record in MEDLINE/PubMed
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Keywords thyroxine
atrial fibrillation
thyrotropin
hypothyroidism
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Snippet Atrial fibrillation (AF) is a highly prevalent disorder leading to heart failure, stroke, and death. Enhanced understanding of modifiable risk factors may...
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SubjectTerms Adult
Aged
Aged, 80 and over
Asymptomatic Diseases
Atrial Fibrillation - diagnosis
Atrial Fibrillation - epidemiology
Biomarkers - blood
Chi-Square Distribution
Female
Humans
Hypothyroidism - blood
Hypothyroidism - diagnosis
Hypothyroidism - epidemiology
Hypothyroidism - physiopathology
Incidence
Male
Middle Aged
Predictive Value of Tests
Prognosis
Proportional Hazards Models
Risk Assessment
Risk Factors
Thyroid Function Tests
Thyroid Gland - metabolism
Thyroid Gland - physiopathology
Thyrotropin - blood
Thyroxine - blood
Time Factors
Young Adult
Title Thyroid Function Within the Normal Range, Subclinical Hypothyroidism, and the Risk of Atrial Fibrillation
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