Electrical bioimpedance measurement during hypothermic rat kidney preservation for assessing ischemic injury

Meritxell Genescà, Antoni Ivorra, Anna Sola, Luis Palacios, Jean Michel Goujon, Thierry Hauet, Rosa Villa, Jordi Aguiló, Georgina Hotter*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)


Non-heart-beating donors sustain an ischemic insult of unknown severity and duration, which can compromise the viability of the graft. This preliminary study aimed to assess whether electrical bioimpedance monitoring of cold preserved organs could be useful to identify kidneys that have suffered previous warm ischemia (WI). Two rat groups were studied during 24 h of preservation in University of Wisconsin solution (UW): a control cold ischemia group and another group subjected previously to 45 min of WI. Multi-frequency bioimpedance was monitored during preservation by means of a miniaturized silicon probe and the results were modeled according to the Cole equation. Tissular ATP content, lactate dehydrogenase in UW solution and histological injury were assessed. Renal function and cell injury, evaluated during 3 h of ex vivo reperfusion using the isolated perfused rat kidney model, demonstrated differences between groups. Bioimpedance results showed that the time constant and the high frequency resistivity parameters derived from the Cole equation were able to discriminate between groups at the beginning of the preservation (Δτ ∼ 78%, ΔR ∼ 36%), but these differences tended to converge as preservation time advanced. Nevertheless, another of the Cole parameters, α, showed increasing significant differences until 24 h of preservation (Δα ∼ 15%).

Original languageEnglish
Pages (from-to)1866-1871
Number of pages6
JournalBiosensors and Bioelectronics
Issue number9
Publication statusPublished - 15 Mar 2005


  • Cold preservation
  • Cole equation
  • Electrical bioimpedance
  • Non-heart-beating donor
  • Rat kidney


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