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Correlation between trans and intra-thoracic impedance and conductance in patients with chronic heart failure.
MedLine Citation:
PMID:  25226339     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
AIMS: In chronic heart failure, changes of intra-thoracic impedance (Z0IT) may suggest impending pulmonary congestion; a similar result has been found by measuring trans-thoracic conductance (TFCTT = 1/Z0 = 1/kΩ). We assumed that a relationship could exist between Z0IT and TFCTT.
METHODS: We collected 140 measurements from 70 patients carrying an implantable cardioverter-defibrillator/cardiac resynchronization device with the CareLink function (71 ± 9 years, New York Heart Association (NYHA) 2.4 ± 0.9, ejection fraction 31 ± 8%, optimal treatment); they were studied during system alarms and after appropriate treatment (diuretics and/or vasodilators, n = 42) or during clinical stability and at the time of a system alarm (n = 28); correspondent BNP values were obtained. We related Z0IT obtained by the device, with TFCTT obtained with a commercial system.
RESULTS: A strong relationship was found between Z0IT and TFCTT. Changes in the variables after treatment or during worsening conditions were of the same direction and order of magnitude, and were related to BNP levels obtained simultaneously.
CONCLUSIONS: Trans-thoracic conductance, similarly to intra-thoracic impedance, may noninvasively point to pulmonary congestion and be useful in patients not carrying an implanted device. The possibility of remotely obtaining this variable should be evaluated for the telemonitoring of heart failure patients.
Authors:
Gabriella Malfatto; Alessandra Villani; Francesco Della Rosa; Valeria Rella; Matteo Oldani; Alessia Giglio; Mario Facchini; Gianfranco Parati
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-15
Journal Detail:
Title:  Journal of cardiovascular medicine (Hagerstown, Md.)     Volume:  -     ISSN:  1558-2035     ISO Abbreviation:  J Cardiovasc Med (Hagerstown)     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101259752     Medline TA:  J Cardiovasc Med (Hagerstown)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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