Graf, Michael; Riedel, Thomas (2017). Electrical impedance tomography: Amplitudes of cardiac related impedance changes in the lung are highly position dependent. PLoS ONE, 12(11), e0188313. Public Library of Science 10.1371/journal.pone.0188313
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BACKGROUND
Electrical impedance tomography (EIT) is used on the thorax to measure impedance changes due to the presence of air and blood in the lung. This experimental study was performed to investigate the effect of posture on cardiac and respiratory related impedance changes.
METHODS
EIT measurements were performed on 14 healthy subjects in left-, right lateral, prone, supine and upright positions. Simultaneously, tidal volume was recorded with an ultrasonic flowmeter. For image reconstruction, the classic Sheffield back-projection and three variants of the modern GREIT algorithm were applied with two different reference frames. Amplitudes of cardiac- and respiratory impedance changes were extracted and compared between the positions.
RESULTS
We found significant differences in both cardiac and respiratory amplitudes between postures. Especially, supine and upright positions showed dramatic changes in amplitude. These differences between postures were unaffected by the change of reference frames in all reconstruction methods except of the classic Sheffield back projection. Possible sources that explain the observed posture dependency are discussed.
CONCLUSION
Researchers and clinicians need to be aware of this phenomenon when comparing EIT amplitudes in different body positions.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine 04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Pneumologie (Pädiatrie) 04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital 04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Paediatric Pneumology |
UniBE Contributor: |
Riedel, Thomas |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
1932-6203 |
Publisher: |
Public Library of Science |
Language: |
English |
Submitter: |
Anette van Dorland |
Date Deposited: |
31 Jan 2018 10:09 |
Last Modified: |
05 Dec 2022 15:09 |
Publisher DOI: |
10.1371/journal.pone.0188313 |
PubMed ID: |
29145478 |
BORIS DOI: |
10.7892/boris.109240 |
URI: |
https://boris.unibe.ch/id/eprint/109240 |
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