Abstract
Based on previous results which suggested that transthoracic electrical-impedance variations correspond to ventilatory air-volume changes within the lung, the capability of the impedance method to detect regional ventilatory changes was tested. Three groups of tetrapolar electrodes were attached to the right-middle and bilateral-diaphragmatic lobe areas on the thoraxes of dogs. Injecting either a single current of 50 kHz or two currents of 50 and 55 kHz simultaneously through these electrodes, impedance changes were measured simultaneously during ventilatory manipulations in either the right-diaphragmatic and mediastinal lobes or the mediastinal lobe. Individual placements of the electrodes detected an independent impedance variation, which corresponded reasonably with the air-volume fluctuation within the right-middle and bilateral-diaphragmatic lobes. No response was observed from the bilateral-diaphragmatic lobe areas on selective manipulation in the mediastinal lobe. From these results, it is clear that the method can detect regional ventilatory variations which occur within the lobe in the immediate vicinity of the electrode.
Published Version
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