The measurement of cardia output by the thoracic impedance method.

A. Adamicza, L. Tutsek, S. Nagy

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The aim of our experiments was to study the thoracic electrical impedance method as a method for measuring cardiac output in anesthetized dogs. Four electrodes were placed around the neck and thorax. A 50 kHz, 1 mA electric current was applied to the outer two electrodes and the two inner electrodes were used to measure impedance changes related to the stroke volume during the cardiac cycle at end-expiratory apnea. The cardiac output obtained by the impedance method was compared to the cardiac output measured by isotope dilution and by the electromagnetic flowmeter. Either mean cardiac output or cardiac output determined beat-to-beat from the pulsatile flow was measured with the latter method. Significant correlations were obtained between the impedance and the isotope dilution method (r = 0.8799), and between the impedance and the electromagnetic (mean) flow measurements (r = 0.7330). The comparison of impedance cardiac output to that determined from the pulsatile flow (beat-to-beat) also showed a good correlation (r = 0.7618). The effect of changing the fluid and air contents in the chest on the basal thoracic impedance was also studied.

Original languageEnglish
Pages (from-to)395-408
Number of pages14
JournalActa Physiologica Hungarica
Volume71
Issue number3
Publication statusPublished - 1988

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Cardia
Electric Impedance
Cardiac Output
Thorax
Pulsatile Flow
Electrodes
Electromagnetic Phenomena
Isotopes
Flowmeters
Apnea
Stroke Volume
Neck
Air
Dogs

ASJC Scopus subject areas

  • Physiology

Cite this

The measurement of cardia output by the thoracic impedance method. / Adamicza, A.; Tutsek, L.; Nagy, S.

In: Acta Physiologica Hungarica, Vol. 71, No. 3, 1988, p. 395-408.

Research output: Contribution to journalArticle

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