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Thoracic electrical impedance tomographic measurements during volume controlled ventilation-effects of tidal volume and positive end-expiratory pressure

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Thoracic electrical impedance tomographic measurements during volume controlled ventilation-effects of tidal volume and positive end-expiratory pressure

Content Provider	IEEE Xplore Digital Library
Author	Frerichs, I. Hahn, G. Hellige, G.
Copyright Year	1982
Abstract	The aim of the study was to analyze thoracic electrical impedance tomographic (EIT) measurements accomplished under conditions comparable with clinical situations during artificial ventilation. Multiple EIT measurements were performed in pigs in three transverse thoracic planes during the volume controlled mode of mechanical ventilation at various tidal volumes (V/sub T/) and positive end-expiratory pressures (PEEP). The protocol comprised following ventilatory patterns: (1) V/sub T/ (400, 500, 600, 700 ml) was varied in a random order at various constant PEEP levels and (2) PEEP (2, 5, 8, 11, 14 cm H/sub 2/O) was randomly modified during ventilation with a constant V/sub T/. The EIT technique was used to generate cross-sectional images of (1) regional lung ventilation and (2) regional shifts in lung volume with PEEP. The quantitative analysis was performed in terms of the tidal amplitude of the impedance change, reflecting the volume of delivered gas at various preset V/sub T/ and the end-expiratory impedance change, revealing the variation of the lung volume at various PEEP levels. The results showed: (1) an increase in the tidal amplitude of the impedance change, proportional to the delivered V/sub T/ at all constant PEEP levels, (2) a rising end-expiratory impedance change, with PEEP reflecting an increase in gas volume, and (3) a PEEP-dependent redistribution of the ventilated gas between the planes. The generated images and the quantitative results indicate the ability of EIT to identify regional changes in V/sub T/ and lung volume during mechanical ventilation.
Sponsorship	IEEE Engineering in Medicine and Biology Society IEEE Nuclear and Plasma Sciences Society IEEE Signal Processing Society IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society
Page Count	10
File Size	645793
Starting Page	764
Ending Page	773
File Format	PDF
ISSN	02780062
Volume Number	18
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tomography Impedance measurement Electric variables measurement Volume measurement Pressure measurement Pressure control Ventilation Lungs Image generation Mechanical variables measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications Radiological and Ultrasound Technology Software

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