Impedance to transthoracic direct current discharge

A model for testing interface material

G. A. Ewy, Douglas L Taren

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

An in vitro method for screening the relative impedance of gels has been developed. A nonconductive chamber was built with 1-cm-diameter electrodes placed 1 cm apart. This chamber is filled with electrode gel to be tested. The defibrillator used delivers a half-sinusoidal waveform. When the same stored energy is discharged by this defibrillator into increasing impedance, the resultant delivered current wave decreases while the voltage wave increases. Thus, with increasing impedance, the delivered volt-time interval increases. Twelve electrode gels were studied; 10 measurements were made on each gel. There is a marked variation in the impedance to direct current discharge of commercially available electrode gels. A large number of commercially available electrode gels are not suitable for use as the interface between the paddle electrodes and the chest wall during elective cardioversion and emergency defibrillation.

Original languageEnglish (US)
Pages (from-to)47-48
Number of pages2
JournalMedical Instrumentation
Volume12
Issue number1
StatePublished - Jan 1978

Fingerprint

Impedance Cardiography
Materials Testing
Electrodes
Gels
Electric Impedance
Testing
Defibrillators
Electric Countershock
Thoracic Wall
Screening
Emergencies
Electric potential

ASJC Scopus subject areas

  • Bioengineering
  • Medicine (miscellaneous)

Cite this

Impedance to transthoracic direct current discharge : A model for testing interface material. / Ewy, G. A.; Taren, Douglas L.

In: Medical Instrumentation, Vol. 12, No. 1, 01.1978, p. 47-48.

Research output: Contribution to journalArticle

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