Development of multielectrode impedance plethysmography |
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Authors: | N Furuya K Nakayama |
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Institution: | (1) Laboratory of Clinical Science Medical Engineering, Dokkyo University School of Medicine, 880 Kitakobayashi, Mibu-machi, Shimotsuga-gun, 321-02 Tochigi, Japan;(2) Department of Electrical & Electronics Engineering College of Science & Technology, Sophia University, Tokyo, Japan |
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Abstract: | The feasibility of simultaneous independent measurements of impedance variations in the right and left apex and base of the
lungs using the technique of multielectrode impedance plethysmography (MIPG) was investigated. To obtain independent impedance
measurements in each region, high impedance sensitivity areas must be localised by weighting the impedance sensitivity distribution.
12 planar coaxial-type electrodes were attached on the right and left upper, middle and lower sites of the anterior and posterior
chest walls. Currents of identical absolute values and differing polarities were simultaneously applied to neightbouring electrodes
and voltage measurements were carried out sagittally at the right and left upper and lower sites of the chest walls. The effect
of weighting the impedance sensitivity distribution was verified through experimental studies on mongrel dogs. The methods
utilised for the induction of regional physiological conductivity changes were selective ventilation and selective indicator
infusion into the pulmonary vasculature. The detected impedance variation showed reasonably indenpendent responses which were
consistent with our expectations from the results of the computer simulation. |
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Keywords: | Impedance plethysmography Impedance sensitivity Multielectrodes Planar coaxial type electrode Selective ventilation Selective indicator infusion |
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