Bein, Thomas and Ploner, Franz and Ritzka, Markus and Pfeifer, Michael and Schlitt, Hans J. and Graf, Bernhard M. (2010) No change in the regional distribution of tidal volume during lateral posture in mechanically ventilated patients assessed by electrical impedance tomography. CLINICAL PHYSIOLOGY AND FUNCTIONAL IMAGING, 30 (4). pp. 234-240. ISSN 1475-0961,
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P>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 degrees) mode up to 60 degrees. 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 degrees-left dependent and 60 degrees-right-dependent) showed a significant correlation between V(T) in supine, left and right lateral positions with the corresponding AUs (r2 = 0 center dot 356, P < 0 center dot 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LUNG VENTILATION; RESPIRATORY MECHANICS; HEMODYNAMICS; THERAPY; PERFUSION; ROTATION; POSITION; FAILURE; PEEP; acute lung injury; electrical impedance tomography; lateral position; mechanical ventilation; tidal volume |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Anästhesiologie Medicine > Lehrstuhl für Chirurgie Medicine > Lehrstuhl für Innere Medizin II |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jul 2020 08:20 |
| Last Modified: | 27 Jul 2020 08:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24484 |
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