M. Melinščak and A. Šantić (Croatia)
voltage pulse plethysmography, current pulse plethysmography, electrode-tissue interface, tissue resistance variation
Measurement of tissue volume changes by voltage pulse plethysmography is being studied. In voltage pulse plethysmography short voltage pulses activate the bio tissue and the characteristics of the transient process are measured. There are two possible implementations: with grounded bio-tissue and with grounded current sampling resistor. Measurement was carried out for both cases and the obtained wave-shapes for blood pulsations in the arteries and for respiration are presented. From the characteristics of measured voltage the parameters of equivalent circuit for electrode-skin interface with three elements are calculated for dry and gel-wetted electrodes.
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