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Endogenous subclinical hyperthyroidism: Metabolic and cardiac parameters.
MedLine Citation:
PMID:  17693232     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: Subclinical hyperthyroidism (SH) is defined by suppressed TSH and normal levels of thyroid hormones. Endogenous subclinical hyperthyroidism (ESH) is probably less common than exogenous SH. Adverse effects of SH due to exogenous administration of thyroxine have been well studied, while the impact of ESH on the cardiovascular system and metabolic parameters remains controversial.
METHODS: In a cross-sectional study, we examined patients with endogenous clinical hyperthyroidism (ECH; n=20), ESH (TSH<0.1 muU/mL, n=25), and mild ESH (TSH=0.1-0.3 muU/mL, n=32), as well as healthy controls (n=50). Biochemical and metabolic parameters influenced by thyroid hormones were assessed and cardiac parameters were studied using echocardiography and 24-hour ECG-blood pressure monitoring.
RESULTS: Biochemical and metabolic parameters did not differ significantly between ESH and healthy subjects. The ECH group had significantly higher sex hormone-binding globulin, osteocalcin, and carboxy-terminal telopeptide levels than healthy subjects. No significant differences were noted in echocardiographic parameters between ESH patients and healthy subjects. The ECH group had a significantly higher heart rate, cardiac output, and cardiac index than the control group, as well as end-diastolic and end-systolic diameters of the left ventricle, and end-diastolic and end-systolic volumes of the left ventricle. The 24-hour ECG-blood pressure monitoring parameters did not differ significantly either between SH and healthy subjects while, in the ECH group, mean heart rate, maximum heart rate, and mean tachycardia episodes were significantly increased.
CONCLUSION: Only subjects with ECH showed differences in metabolic and cardiac parameters from controls, while no significant effects were noted in the endogenous subclinical forms.
Authors:
T Psaltopoulou; I Ilias; S Toumanidis; E Mantzou; P Marafellia; G Piperingos; D A Koutras; M Alevizaki
Publication Detail:
Type:  Journal Article     Date:  2007-06-27
Journal Detail:
Title:  European journal of internal medicine     Volume:  18     ISSN:  0953-6205     ISO Abbreviation:  Eur. J. Intern. Med.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9003220     Medline TA:  Eur J Intern Med     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  423-9     Citation Subset:  -    
Affiliation:
Department of Medical Therapeutics, Alexandra Hospital, Athens University School of Medicine, Greece.
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