Changes in electrical resistivity of swine liver after occlusion and postmortem

D. Haemmerich, O. R. Ozkan, J. Z. Tsai, S. T. Staelin, S. Tungjitkusolmun, D. M. Mahvi, J. G. Webster*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

The resistivity of swine liver tissue was measured in vivo, during induced ischaemia and post-mortem, so that associated changes in resistivity could be quantified. Plunge electrodes, the four-terminal method and a computer-automated measurement system were used to acquire resistivities between 10 Hz and 1 MHz. Liver resistivity was measured in vivo in three animals at 11 locations. At 10 Hz, resistivity was 758 ± 170 Ω·cm. At 1 MHz, the resistivity was 250 ± 40Ω·cm. The resistivity time course was measured during the first 10 min after the liver blood supply in one animal had been occluded. Resistivity increased steadily during occlusion. The change in resistivity of an excised tissue sample was measured during the first 12 h after excision in one animal. Resistivity increased during the first 2 h by 53% at 10 Hz and by 32% at 1 MHz. After 2 h, resistivity decreased, probably owing to membrane breakdown. The resistivity data were fitted to a Cole-Cole circle, from which extracellular resistance Re, intracellular resistance Ri and cell membrane capacitance Cm were estimated. Re increased during the first 2 h by 95% and then decreased, suggesting an increase in extracellular volume. Cm increased during the first 4 h by 40%, possibly owing to closure of membrane channels, and then decreased, suggesting membrane breakdown. Ri stayed constant during the initial 6 h and then increased.

Original languageEnglish (US)
Pages (from-to)29-33
Number of pages5
JournalMedical and Biological Engineering and Computing
Volume40
Issue number1
DOIs
StatePublished - Jan 1 2002

Keywords

  • Ex vivo resistivity
  • In vitro resistivity
  • In vivo resistivity
  • Liver resistivity
  • Radiofrequency
  • Tissue resistivity

ASJC Scopus subject areas

  • Biomedical Engineering
  • Computer Science Applications

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