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J Appl Physiol 93: 660-666, 2002. First published April 15, 2002; doi:10.1152/japplphysiol.00081.2002
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Vol. 93, Issue 2, 660-666, August 2002

Detection of local lung air content by electrical impedance tomography compared with electron beam CT

Inéz Frerichs1, José Hinz1, Peter Herrmann2, Gerald Weisser3, Günter Hahn1, Taras Dudykevych1, Michael Quintel2, and Gerhard Hellige1

1 Department of Anesthesiological Research, Center of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, D-37075 Göttingen; and Institutes of 2 Anesthesiology and Operative Intensive Care and 3 Clinical Radiology, University Hospital Mannheim, D-68167 Mannheim, Germany

The aim of the study was to validate the ability of electrical impedance tomography (EIT) to detect local changes in air content, resulting from modified ventilator settings, by comparing EIT findings with electron beam computed tomography (EBCT) scans obtained under identical steady-state conditions. The experiments were carried out on six anesthetized supine pigs ventilated with five tidal volumes (VT) at three positive end-expiratory pressure (PEEP) levels. The lung air content changes were determined both by EIT (Goe-MF1 system) and EBCT (Imatron C-150XP scanner) in six regions of interest, located in the ventral, middle, and dorsal areas of each lung, with respect to the reference air content at the lowest VT and PEEP, as a change in either local electrical impedance or lung tissue density. An increase in local air content with VT and PEEP was identified by both methods at all regions studied. A good correlation between the changes in lung air content determined by EIT and EBCT was revealed. Mean correlation coefficients in the ventral, middle, and dorsal regions were 0.81, 0.87, and 0.93, respectively. The study confirms that EIT is a suitable, noninvasive method for detecting regional changes in air content and monitoring local effects of artificial ventilation.

noninvasive monitoring; electron beam computed tomography; positive end-expiratory pressure; ventilation distribution


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