The time taken for the regional distribution of ventilation to stabilise: An investigation using electrical impedance tomography

Caruana, LR, Paratz, JD, Chang, A, Barnett, AG, & Fraser, JF (2015) The time taken for the regional distribution of ventilation to stabilise: An investigation using electrical impedance tomography. Anaesthesia and Intensive Care, 43(1), pp. 88-91.

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Abstract

Electrical impedance tomography is a novel technology capable of quantifying ventilation distribution in the lung in real time during various therapeutic manoeuvres. The technique requires changes to the patient’s position to place the electrical impedance tomography electrodes circumferentially around the thorax. The impact of these position changes on the time taken to stabilise the regional distribution of ventilation determined by electrical impedance tomography is unknown. This study aimed to determine the time taken for the regional distribution of ventilation determined by electrical impedance tomography to stabilise after changing position. Eight healthy, male volunteers were connected to electrical impedance tomography and a pneumotachometer. After 30 minutes stabilisation supine, participants were moved into 60 degrees Fowler’s position and then returned to supine. Thirty minutes was spent in each position. Concurrent readings of ventilation distribution and tidal volumes were taken every five minutes. A mixed regression model with a random intercept was used to compare the positions and changes over time. The anterior-posterior distribution stabilised after ten minutes in Fowler’s position and ten minutes after returning to supine. Left-right stabilisation was achieved after 15 minutes in Fowler’s position and supine. A minimum of 15 minutes of stabilisation should be allowed for spontaneously breathing individuals when assessing ventilation distribution. This time allows stabilisation to occur in the anterior-posterior direction as well as the left-right direction.

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ID Code: 85137
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: lung, ventilation, electrical impedance tomography, stabilisation, position change, regional ventilation, equalibration
ISSN: 1448-0271
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Copyright Owner: Copyright 2015 Australian Society of Anaesthetists Ltd.
Deposited On: 06 Jul 2015 22:49
Last Modified: 13 Jul 2015 21:11

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