Transcellular and extracellular impedances of the intact abdomen in putrefying rat cadavers

Total (Zt) and extracellular (Ze) abdominal impedances of putrefying rat cadavers, stored at 18.0±0.7°C, were measured at 50 kHz and at 1 kHz, respectively, during the first 7 days of death. Transcellular impedance was calculated from the measured values of Zt and Ze. Total impedance and Ze increase...

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Bibliographic Details
Published in:Forensic science international 1997-12, Vol.90 (3), p.185-195
Main Authors: Querido, David, Phillips, Mike R.B
Format: Article
Language:English
Subjects:
Abdomen
Abdomen - physiopathology
Accuracy
Animals
Biological and medical sciences
Body Composition
Cadavers
Cell Membrane - physiology
Cell membranes
Circuits
Degeneration
Electric Impedance
Electrical impedance
Electrodes
Extracellular Space - physiology
Follow-Up Studies
Forensic science
Fundamental and applied biological sciences. Psychology
General aspects
Impedance
Impedance measurement
Male
Postmortem Changes
Postmortem interval
Putrefaction
Rats
Reproducibility
Reproducibility of Results
Time Factors
Time since death
Tissues
Vertebrates: digestive system
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Summary:Total (Zt) and extracellular (Ze) abdominal impedances of putrefying rat cadavers, stored at 18.0±0.7°C, were measured at 50 kHz and at 1 kHz, respectively, during the first 7 days of death. Transcellular impedance was calculated from the measured values of Zt and Ze. Total impedance and Ze increased during the first day, and then decreased with increasing postmortem interval, while Zi remained unchanged during the first 3 days before increasing more than 4-fold between 3 and 7 days postmortem. These changes are consistent with net gain of electrolyte by the extracellular fluids and with degeneration of cell membranes which occur postmortem. It is concluded that, during putrefaction, Ze is a potentially more useful index of postmortem interval than Zt or Zi, and that measurement of total abdominal impedance at 50 kHz, rather than at 10 kHz, markedly improves the precision and accuracy of impedance measurement.
ISSN:0379-0738
1872-6283
DOI:10.1016/S0379-0738(97)00164-3