Impedance cardiography: The failure of sternal electrodes to predict changes in stroke volume

Robert P Patterson, L. Wang, G. McVeigh, R. Burns, Jay N Cohn

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

A study was conducted on 26 healthy male adults comparing the stroke volume (SV) and cardiac output (CO) measured with green dye and impedance cardiography in supine, sitting and during 50 W bicycle exercise. The impedance voltage pick-up electrodes were modified from the standard band location and placed at the suprasternal notch and 10 cm below. The percentage change of SV going from supine to sitting was -27.2 ± 7.4% and -16.9 ± 22% for the dye and impedance values respectively. The percentage change of SV going from sitting to exercise was 20.9 ± 11.9% and 36.7 ± 32.9% for the dye and impedance values respectively. The percentage change in SV determined by impedance shows poor correlation (supine to sitting R = 0.16 and sitting to exercise R = 0.42) with dye values. The individual impedance values for a given change in position or exercise showed considerably more variation compared with the dye. Impedance determination of SV using electrodes on the sternum does not appear to be a valid method for SV and CO measurements.

Original languageEnglish (US)
Pages (from-to)33-41
Number of pages9
JournalBiological Psychology
Volume36
Issue number1-2
DOIs
StatePublished - Aug 1993

Keywords

  • Impedance cardiology
  • cardiac output
  • electrodes
  • stroke volume

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