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BioelectromagnetismPrinciples and Applications of Bioelectric and Biomagnetic Fields$
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Jaakko Malmivuo and Robert Plonsey

Print publication date: 1995

Print ISBN-13: 9780195058239

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195058239.001.0001

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Impedance Plethysmography

Impedance Plethysmography

Chapter:
(p.405) Chapter 25 Impedance Plethysmography
Source:
Bioelectromagnetism
Author(s):

Jaakko Malmivuo

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195058239.003.0025

Determination of the cardiac stroke volume is an area in which accurate, easily applied, noninvasive methods are needed. Impedance cardiography is easy to apply, noninvasive, and also cheap; however, it has serious methodological limitations. This chapter provides a brief overview of other applications of impedance plethysmography. The magnetic method corresponding to electric impedance plethysmography is called magnetic susceptibility plethysmography. This method may be used for monitoring blood volume changes in the thorax. Most living tissues are diamagnetic since water is their major constituent. If a strong magnetic field is applied to the region of the thorax, the movements of the heart, blood, and chest wall during the heart cycle cause variations in magnetic flux.

Keywords:   cardiac stroke, impedance plethysmography, blood volume, thorax, heart cycle, magnetic flux

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