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Follow-up of congenital heart disease patients with subclinical hypothyroidism

Published online by Cambridge University Press:  23 September 2014

Efrén Martínez-Quintana*
Affiliation:
Cardiology Service, Complejo Hospitalario Universitario Insular-Materno InfantilLas Palmas de Gran Canaria, Spain
Fayna Rodríguez-González
Affiliation:
Dr Negrín University Hospital of Gran Canaria, Las Palmas de Gran Canaria, Spain
*
Correspondence to: E. Martínez Quintana, MD, PhD, Cardiology Service, Complejo Universitario Insular-Materno Infantil, Avenida Marítima del Sur s/n. 35016, Las Palmas de Gran Canaria, Spain. Tel: +0034 928441360; Fax: +0034 928441853; E-mail: efrencardio@gmail.com

Abstract

Introduction: Subclinical hypothyroidism or mild thyroid failure is a common problem in patients without known thyroid disease. Methods: Demographic and analytical data were collected in 309, of which 181 were male and 128 were female, congenital heart disease (CHD) patients. CHD patients with thyroid-stimulating hormone above 5.5 mIU/L were also followed up from an analytical point of view to determine changes in serum glucose, cholesterol, N-terminal pro b-type natriuretic peptide, and C-reactive protein concentrations. Results: Of the CHD patients, 35 (11.3%) showed thyroid-stimulating hormone concentration above 5.5 mIU/L. Of them, 27 were followed up during 2.4±1.2 years – 10 were under thyroid hormone replacement treatment, and 17 were not. Of the 27 patients (25.9%), 7 with subclinical hypothyroidism had positive anti-thyroid peroxidase, and 3 of them (42.8%) with positive anti-thyroid peroxidase had Down syndrome. Down syndrome and hypoxaemic CHD patients showed higher thyroid-stimulating hormone concentrations than the rest of the congenital patients (p<0.001). No significant differences were observed in serum thyroxine, creatinine, uric acid, lipids, C-reactive protein, or N-terminal pro b-type natriuretic peptide concentrations before and after the follow-up in those CHD patients with thyroid-stimulating hormone above 5.5 mIU/L whether or not they received levothyroxine therapy. Conclusions: CHD patients with subclinical hypothyroidism showed no significant changes in serum thyroxine, cholesterol, C-reactive protein, or N-terminal pro b-type natriuretic peptide concentrations whether or not they were treated with thyroid hormone replacement therapy.

Type
Original Articles
Copyright
© Cambridge University Press 2014 

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