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No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography

We assessed the distribution of regional lung ventilation during moderate and steep lateral posture using electrical impedance tomography (EIT) in mechanically ventilated patients. Seven patients were placed on a kinetic treatment table. An elastic belt containing 16 electrodes was placed around the...

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Autores principales: Bein, Thomas, Ploner, Franz, Ritzka, Markus, Pfeifer, Michael, Schlitt, Hans J, Graf, Bernhard M
Formato: Texto
Lenguaje:English
Publicado: Blackwell Publishing Ltd 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2913102/
https://www.ncbi.nlm.nih.gov/pubmed/20491842
http://dx.doi.org/10.1111/j.1475-097X.2010.00933.x
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author Bein, Thomas
Ploner, Franz
Ritzka, Markus
Pfeifer, Michael
Schlitt, Hans J
Graf, Bernhard M
author_facet Bein, Thomas
Ploner, Franz
Ritzka, Markus
Pfeifer, Michael
Schlitt, Hans J
Graf, Bernhard M
author_sort Bein, Thomas
collection PubMed
description We assessed the distribution of regional lung ventilation during moderate and steep lateral posture using electrical impedance tomography (EIT) in mechanically ventilated patients. Seven patients were placed on a kinetic treatment table. An elastic belt containing 16 electrodes was placed around the chest and was connected to the EIT device. Patients were moved to left and right lateral positions in a stepwise (10°) mode up to 60°. EIT images [arbitrary units (AU)] were generated and scanned for assessment of relative ventilation distribution changes [tidal volume (V(T))]. A calibration procedure of arbitrary units (AUs) versus ventilator-derived V(T) performed in all patients during three predefined positions (supine, 60°-left dependent and 60°-right-dependent) showed a significant correlation between V(T) in supine, left and right lateral positions with the corresponding AUs (r(2) = 0·356, P<0·05). Changes in V(T) were calculated and compared to supine position, and specific regions of interest (ROIs) were analysed. In our study, in contrast to recent findings, a change in lateral positions did not induce a significant change in regional tidal volume distribution. In right lateral positions, a broader variation of V(T) with a trend towards an increase in the dependently positioned lung was observed in comparison with supine. Lateral positioning promotes the redistribution of ventilation to the ventral regions of the lung. The use of EIT technology might become a helpful tool for understanding and guiding posture therapy in mechanically ventilated patients.
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spelling pubmed-29131022010-08-03 No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography Bein, Thomas Ploner, Franz Ritzka, Markus Pfeifer, Michael Schlitt, Hans J Graf, Bernhard M Clin Physiol Funct Imaging Original Articles We assessed the distribution of regional lung ventilation during moderate and steep lateral posture using electrical impedance tomography (EIT) in mechanically ventilated patients. Seven patients were placed on a kinetic treatment table. An elastic belt containing 16 electrodes was placed around the chest and was connected to the EIT device. Patients were moved to left and right lateral positions in a stepwise (10°) mode up to 60°. EIT images [arbitrary units (AU)] were generated and scanned for assessment of relative ventilation distribution changes [tidal volume (V(T))]. A calibration procedure of arbitrary units (AUs) versus ventilator-derived V(T) performed in all patients during three predefined positions (supine, 60°-left dependent and 60°-right-dependent) showed a significant correlation between V(T) in supine, left and right lateral positions with the corresponding AUs (r(2) = 0·356, P<0·05). Changes in V(T) were calculated and compared to supine position, and specific regions of interest (ROIs) were analysed. In our study, in contrast to recent findings, a change in lateral positions did not induce a significant change in regional tidal volume distribution. In right lateral positions, a broader variation of V(T) with a trend towards an increase in the dependently positioned lung was observed in comparison with supine. Lateral positioning promotes the redistribution of ventilation to the ventral regions of the lung. The use of EIT technology might become a helpful tool for understanding and guiding posture therapy in mechanically ventilated patients. Blackwell Publishing Ltd 2010-07 /pmc/articles/PMC2913102/ /pubmed/20491842 http://dx.doi.org/10.1111/j.1475-097X.2010.00933.x Text en Journal compilation © 2010 Scandinavian Society of Clinical Physiology and Nuclear Medicine http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.
spellingShingle Original Articles
Bein, Thomas
Ploner, Franz
Ritzka, Markus
Pfeifer, Michael
Schlitt, Hans J
Graf, Bernhard M
No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title_full No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title_fullStr No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title_full_unstemmed No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title_short No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
title_sort no change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2913102/
https://www.ncbi.nlm.nih.gov/pubmed/20491842
http://dx.doi.org/10.1111/j.1475-097X.2010.00933.x
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