Towards a theoretical understanding of stroke volume estimation with impedance cardiography
| Autor: | E. Raaijmakers, J. H. Meijer, Robert M. Heethaar, H. G. Goovaerts, Th. J. C. Faes |
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| Rok vydání: | 1999 |
| Předmět: |
Adult
Male medicine.medical_specialty Hemodynamics Systemic circulation Cardiography Impedance Models Biological General Biochemistry Genetics and Molecular Biology History and Philosophy of Science Thoracic impedance medicine.artery Internal medicine medicine Electric Impedance Humans Electrical impedance Aorta Chemistry General Neuroscience Heart Stroke Volume Stroke volume Mechanics Heart activity Middle Aged Thorax Cardiology Wounds and Injuries Outflow Female |
| Zdroj: | Annals of the New York Academy of Sciences. 873 |
| ISSN: | 0077-8923 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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