Electrcal admittance plethysmgram, simply called as admittance plethysmgram, has been developed on the basis of electrical impedance plethysmo-gram. Admittance plethysmgram determines the biological information and has significant advantage as compared with electrical impedance plethysmo-gram. It receives less influences by the electric resistance, having better reproducibility and increased precision. The shape characteristics and loop dimension of the admittance loop processed by couputer can be observed easier and can show the blood flow volume and speed objectively and quantitatively. It is noninvasive and eimple method, helpful for diagnosiss and adjustment of disease condition.
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