The effect of blood resistivity changes on impedance cardiography determined by 3D finite difference models of human thorax

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Abstract

The effect of blood resistivity changes in major vessels on the cardiogenic impedance signal was studied using three dimensional (3D) finite difference models of human thorax. The vessels studied included ascending aorta (AA), descending aorta (DA), common carotid artery (CA), superior vena cava (SVC), inferior vena cava (IVC) and internal jugular vein (JV). The end systolic data indicate that the impedance varies linearly with the percentage (%) change of blood resistivity in all vessels (R2>0.99). For a given blood resistivity change, the relative contributions are 34 % from 1)A, 27% from AA, 18% from SVC, 8% from CA, 7% from IVC and 6% from JV (the total is 69% from arteries and 31 % from veins). The results suggest that the blood resistivity change plays a major role in impedance cardiography to account for the negative impedance change (ΔZ) normally recorded from subjects.

Original languageEnglish (US)
Title of host publicationProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992
EditorsJean Louis Coatrieux, Robert Plonsey, Swamy Laxminarayan, Jean Pierre Morucci
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1736-1737
Number of pages2
ISBN (Electronic)0780307852
DOIs
StatePublished - Jan 1 1992
Event14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992 - Paris, France
Duration: Oct 29 1992Nov 1 1992

Publication series

NameProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Volume5
ISSN (Print)1557-170X

Conference

Conference14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992
CountryFrance
CityParis
Period10/29/9211/1/92

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