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Transthoracic impedance compared to magnetic resonance imaging in the assessment of cardiac output.
MedLine Citation:
PMID:  23152290     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Cardiac magnetic resonance imaging is considered the gold-standard method for the calculation of cardiac volumes. Transthoracic impedance cardiography assesses the cardiac output. No studies validating this measurement, in comparison to that obtained by magnetic resonance imaging, are available. OBJECTIVE: To evaluate the performance of transthoracic impedance cardiography in the calculation of the cardiac output, cardiac index and stroke volume using magnetic resonance imaging as the gold-standard. METHODS: 31 patients with a mean age of 56.7 ± 18 years were assessed; of these, 18 (58%) were males. Patients whose indication for magnetic resonance imaging required pharmacologic stress test were excluded. Correlation between methods was assessed using the Pearson's coefficient, and dispersion of absolute differences in relation to the mean was demonstrated using the Bland-Altman's method. Agreement between methods was analyzed using the intraclass correlation coefficient. RESULTS: The mean cardiac output by transthoracic impedance cardiography and by magnetic resonance imaging was 5.16 ± 0.9 and 5.13 ± 0.9 L/min, respectively. Good agreement between methods was observed for cardiac output (r = 0.79; p = 0.0001), cardiac index (r = 0.74; p = 0.0001) and stroke volume (r = 0.88; p = 0.0001). The analysis by the Bland-Altman plot showed low dispersion of differences in relation to the mean, with a low amplitude of agreement intervals. Good agreement between the two methods was observed when analyzed by the intraclass correlation coefficient, with coefficients for cardiac output, cardiac index and stroke volume of 0.78, 0.73 and 0.88, respectively (p < 0.0001 for all comparisons). CONCLUSION: Transthoracic impedance cardiography proved accurate in the calculation of the cardiac output in comparison to cardiac magnetic resonance imaging.
Authors:
Humberto Villacorta Junior; Aline Sterque Villacorta; Fernanda Amador; Marcelo Hadlich; Denilson Campos de Albuquerque; Clerio Francisco Azevedo
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-16
Journal Detail:
Title:  Arquivos brasileiros de cardiologia     Volume:  -     ISSN:  1678-4170     ISO Abbreviation:  Arq. Bras. Cardiol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421031     Medline TA:  Arq Bras Cardiol     Country:  -    
Other Details:
Languages:  ENG; POR     Pagination:  -     Citation Subset:  -    
Affiliation:
Universidade Federal Fluminense, Rio de Janeiro, RJ, Brasil.
Vernacular Title:
Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco.
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