| Towards a theoretical understanding of stroke volume estimation with impedance cardiography. | |
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MedLine Citation:
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PMID: 10372160 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In electrical impedance cardiography, Kubicek's formula is often used to measure stroke volume from thoracic impedance variations synchronously to heart activity. To calculate stroke volume from impedance variations, the so-called outflow problem should be adequately solved. This outflow problem refers to the joint causes of impedance change due to blood entering the aorta from the heart, as well as blood leaving the aorta due to arterial runoff. The aim of this study was to investigate the Kubicek formula as a solution of the outflow problem. Kubicek's formula was theoretically investigated using a simple model of the volume-conducting properties of the thorax (two-cylinder model), as well as the hemodynamics of the systemic circulation (three-element "windkessel" model). The mathematical analysis showed that the outflow problem was not solved by the Kubicek formula. Moreover, this theoretical result was experimentally confirmed. |
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Authors:
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T J Faes; E Raaijmakers; J H Meijer; H G Goovaerts; R M Heethaar |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Annals of the New York Academy of Sciences Volume: 873 ISSN: 0077-8923 ISO Abbreviation: Ann. N. Y. Acad. Sci. Publication Date: 1999 Apr |
Date Detail:
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Created Date: 1999-07-01 Completed Date: 1999-07-01 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7506858 Medline TA: Ann N Y Acad Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 128-34 Citation Subset: IM |
Affiliation:
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Department of Clinical Physics and Informatics, University Hospital Vrije Universiteit, Amsterdam, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cardiography, Impedance / methods* Electric Impedance Female Heart / physiopathology* Hemodynamics Humans Male Middle Aged Models, Biological Stroke Volume* Thorax Wounds and Injuries / physiopathology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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