• Ann. N. Y. Acad. Sci. · Apr 1999

    Comparative Study

    Monitoring regional lung ventilation by functional electrical impedance tomography during assisted ventilation.

    • I Frerichs, G Hahn, H Schiffmann, C Berger, and G Hellige.
    • Department of Anesthesiological Research, University of Göttingen, Germany.
    • Ann. N. Y. Acad. Sci. 1999 Apr 20;873:493-505.

    AbstractA new approach in discriminating the regional air volume changes in the lungs associated with either spontaneous or mechanical ventilation during assisted ventilation is presented. Impedance data are obtained by conventional electrical impedance tomography (EIT). The data are filtered in the range of either the spontaneous or the ventilator rate and processed by the functional EIT (f-EIT) evaluation technique, whereby the variation of the respective EIT data with time is determined and imaged. EIT measurements performed in an infant during synchronized intermittent mandatory ventilation were evaluated with this method and indicated that the specific local lung volume swings related to spontaneous and mechanical inhalations can be separated and imaged as tomograms. This noninvasive approach may become useful in optimizing the ventilatory pattern during advanced forms of artificial ventilation and may help the clinician in the therapy management of individual patients.

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