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Subclinical hyperthyroidism as a risk factor for atrial fibrillation

Auer, J, Scheibner, P, Mische, T, Langsteger, W, Eber, O und Eber, B (2001) Subclinical hyperthyroidism as a risk factor for atrial fibrillation. American Heart Journal, 142 (5). pp. 838-842. ISSN 1097-6744

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Kurzfassung

OBJECTIVES Atrial fibrillation is a well-known manifestation of hyperthyroidism. We studied whether subclinical hyperthyroidism with low serum thyrotropin concentrations and free thyroid hormone concentrations within the normal range in clinically euthyroid persons is a risk factor for subsequent atrial fibrillation. METHODS We studied 23,638 persons. The subjects were classified according to their serum thyrotropin concentrations: group 1 comprised those with normal values of serum thyrotropin concentration (>0.4-5.0 mU/L) and free tri-iodothyronine and free thyroxine concentrations were within the normal range (22,300 subjects), group 2 comprised those with both low serum thyrotropin values (</=0.03 mU/L) and elevated free tri-iodothyronine and free thyroxine concentrations (725 subjects), and group 3 comprised those with low values of serum thyrotropin (<0.4 mU/L) and free triiodothyronine and free thyroxine concentrations were within the normal range (613 subjects). RESULTS Atrial fibrillation was present in 513 persons (2.3%) in group 1 with normal values for serum thyrotropin, 100 (13.8%) in group 2 with overt hyperthyroidism, and 78 (12.7%) in group 3 with subclinical hyperthyroidism. The prevalence of atrial fibrillation in patients with low serum thyrotropin concentrations (<0.4 mU/L) was 13.3% compared with 2.3% in patients with normal values for serum thyrotropin (P <.01). The relative risk of atrial fibrillation in subjects with low serum thyrotropin and normal free tri-iodothyronine and free thyroxine concentrations, compared with those with normal concentrations of serum thyrotropin, was 5.2 (95% CI 2.1-8.7, P <.01). CONCLUSION A low serum thyrotropin concentration is associated with a >5-fold higher likelihood for the presence of atrial fibrillation with no significant difference between subclinical and overt hyperthyroidism.

Typ des Eintrags: Fachpublikation (peer reviewed)
Bereiche: Ordensklinikum Linz Barmherzige Schwestern > Nuklearmedizin
Benutzer: Prof. Werner Langsteger
Hinterlegungsdatum: 20 Mär 2019 08:23
Letzte Änderung: 20 Mär 2019 08:23
URI: http://eprints.vinzenzgruppe.at/id/eprint/8616

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