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Low triiodothyronine and exercise capacity in heart failure.
MedLine Citation:
PMID:  20888651     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: Cardiopulmonary exercise test (CPT) has a prominent value in assessing clinical severity in chronic heart failure (HF) patients. Reduced free triiodothyronine (fT3) plasma level is associated with a more severe disease and prognosis. The aim of this study was to evaluate the relationship between low fT3 plasma level and reduced exercise capacity in chronic HF, and to determine the influence of a low T3 status in subsets of patients with different functional impairment.
METHODS AND RESULTS: 240 HF patients (79% males; age 62±12years, mean±standard deviation; left ventricular ejection fraction, EF, 30±9%) underwent a CPT, clinical and neurohormonal characterization (assay for plasma brain natriuretic peptide, BNP, norepinephrine, aldosterone, renin activity, fT3, free T4, thyroid-stimulating hormone). At multivariate analysis in the whole population, age, gender and BNP level were independently associated with peak VO2, whereas in patients with severe functional impairment (peak VO2<14ml/min/kg) fT3 resulted independently related to peak VO2, together with gender and BNP. When patients with peak VO2<14ml/min/kg were divided according to fT3 levels, patients with low T3 syndrome showed reduced exercise capacity and worse ventilatory efficiency.
CONCLUSIONS: BNP and fT3 are independently associated with exercise capacity in severely compromised HF patients.
Authors:
Marianna Fontana; Claudio Passino; Roberta Poletti; Luc Zyw; Concetta Prontera; Maria Scarlattini; Aldo Clerico; Michele Emdin; Giorgio Iervasi
Publication Detail:
Type:  Journal Article     Date:  2010-10-02
Journal Detail:
Title:  International journal of cardiology     Volume:  154     ISSN:  1874-1754     ISO Abbreviation:  Int. J. Cardiol.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-01-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  153-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Division of Cardiovascular Medicine, Fondazione G. Monasterio CNR-Regione Toscana, Pisa, Italy.
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