Measurement of ventricular volume by intracardiac impedance: theoretical and empirical approaches

The most widely used equation, V = rho L super(2)/R, is developed for the computation of ventricular volume from catheter based impedance measurements. The assumptions implicit in this derivation are examined and found to be generally invalid. An empirical discrete resistor model is described which...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1986-02, Vol.33 (2), p.189-195
Main Authors: SALO, R. W, WALLNER, T. G, PEDERSON, B. D
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Cardiac Catheterization - methods
Cardiac Volume
Cardiography, Impedance - methods
Cardiovascular system
Dogs
Investigative techniques of hemodynamics
Investigative techniques, diagnostic techniques (general aspects)
Mathematics
Medical sciences
Models, Cardiovascular
Plethysmography, Impedance - methods
Stroke Volume
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Summary:The most widely used equation, V = rho L super(2)/R, is developed for the computation of ventricular volume from catheter based impedance measurements. The assumptions implicit in this derivation are examined and found to be generally invalid. An empirical discrete resistor model is described which includes the impedance of the myocardial tissue and the adjoining ventricular blood volume. Once the parameters of this model are determined for individual canine hearts, the model predicts stroke volume from measured impedances.
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.1986.325890