Linearity of transthoracic conductance with respect to electrode force and area during high-voltage defibrillation shocks

Canine transthoracic conductance (G/sub T/) was measured during high-voltage defibrillation shocks to test the hypothesis that (G/sub T/) is a linear function of electrode force (F) and electrode area (A). Symmetric protocols were used to compensate for changes in (G/sub T/) with respect to shock nu...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1994-08, Vol.41 (8), p.801-804
Main Authors: Lerman, B.B., Ng, K.T., Deale, O.C.
Format: Article
Language:English
Subjects:
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Animals
Area measurement
Biological and medical sciences
Defibrillation
Dogs
Electric Conductivity
Electric Countershock - instrumentation
Electric Impedance
Electric shock
Electrodes
Emergency and intensive cardiocirculatory care. Cardiogenic shock. Coronary intensive care
Force measurement
Intensive care medicine
Linear Models
Linearity
Medical sciences
Protocols
Stainless Steel
Steel
Testing
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Summary:Canine transthoracic conductance (G/sub T/) was measured during high-voltage defibrillation shocks to test the hypothesis that (G/sub T/) is a linear function of electrode force (F) and electrode area (A). Symmetric protocols were used to compensate for changes in (G/sub T/) with respect to shock number (n). Stainless steel electrodes were employed with a force-control system for precise selection and control of both F and A at each shock. For a constant A=60 cm/sup 2/, G/sub T/ was linear (r=0.996, 0.995, 0.971, 0.992, 0.995) over five dogs for 30 N/spl les/F/spl les/70 N. For a constant F=50 N, G/sub T/ was linear (r=0.992, 0.998, 0.994, 0.992) over four dogs for 20 cm/sup 2//spl les/A/spl les/60 cm/sup 2/, and in one dog (r=0.996) for 40 cm/sup 2//spl les/A/spl les/90 cm/sup 2/. The quantitative relationship demonstrated for G/sub T/ and F and A can be used in the design of experiments and interpretation of results used for validation of numerical defibrillation models.< >
ISSN:0018-9294
1558-2531
DOI:10.1109/10.310095