Journal Article10.1109/TBME.1971.4502787
An Application of Electrocardiographic Lead Theory to Impedance Plethysmography
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TL;DR: The change in mutual impedance ?
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Abstract: The change in mutual impedance ?Z resulting from a change ?g in the conductivity of a particular region of a volume conductor is shown to be given by ?Z = - ?g?Lt?·L? dv. L? and L? are the lead fields associated with the two ports used to measure ?Z. The integration is over the region where the conductivity has changed. The superscript t indicates that the lead field is to be evaluated following the change in conductivity. An example involving a spherical conductor is provided.
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References
Electrocardiographic leads. I. Introduction.
TL;DR: Various experimental and theoretic technics which can be used in the analysis of a given lead, and in the building up, or "synthesis," of leads having desired characteristics are discussed.
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Lead vectors and transfer impedance.
TL;DR: The purpose of this study is to provide theoretical and technical means for testing objectively the degree of consistency between the several popular electrocardiographic recording systems and to provide a mental tool for easy understanding of the universal relationship between measured potential and active source, independent of the peculiarities of a particular lead system used in any specific study.
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Averaging techniques employing several simultaneous physiological variables.
TL;DR: Average response computing procedures have been used very effectively in retrieving coherent patterns of activity out of seemingly random signals where the coherent components of the signals are evoked by a deliberately applied and, hence, accessible stimulus or signal.
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