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Experimental study of the relationship between the base impedance and its time derivative in impedance plethysmography
Author(s) -
Djordjevich L.,
Sadove M. S.
Publication year - 1981
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594910
Subject(s) - electrical impedance , plethysmograph , constant (computer programming) , derivative (finance) , component (thermodynamics) , mathematics , function (biology) , mathematical analysis , physics , nuclear magnetic resonance , thermodynamics , computer science , medicine , cardiology , quantum mechanics , evolutionary biology , biology , financial economics , economics , programming language
Transthoracic electrical impedance Z consists of a constant baseline component Z 0 and the time variable component Δ Z such that Z = Z 0 +Δ Z . The first time derivative of Z has a negative peak, the magnitude of which is ( dZ / dt ) min . Measurements of 170 volunteers show that ( dZ / dt ) min is a function of the constant baseline component Z 0 . This implies that at least a part of the difference of the magnitudes of ( dZ / dt ) min on Z 0 must be taken into account in order to avoid erroneous conclusions or inaccurate calculations.