Pressure-Induced Changes of Electrode Impedance Cause Negligible Errors in Impedance Plethysmography

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The pulsatile changes of electrical impedance measured in the limb have been ascribed to changes of blood volume, to changes of blood resistivity, and to changes of electrode impedance. The most controversial claim for the origin of the impedance pulse is that of pressure-induced changes of electrode impedance. We have proven that changes of electrode impedance with pressure do not contribute to the measured electrical impedance pulse and that changes of electrode impedance cause negligible errors.

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