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Nerve conduction as a means of estimating early post-mortem interval
K J Straton1, A Busuttil, M A Glasby
1Department of Anatomy, University of Edinburgh Medical School, UK.
International Journal of Legal Medicine
|January 1, 1992
Summary
Determining time of death can be unreliable. This study found that the chronaxie of the sciatic nerve increases linearly after death, offering a potential new forensic method for estimating the post mortem interval.
Area of Science:
- Forensic Science
- Neurophysiology
- Biophysics
Background:
- Current methods for determining time of death, primarily body cooling, are often unreliable.
- Nerve conduction properties theoretically decline with metabolic cessation after death.
- Existing methods lack precision for early post mortem intervals.
Purpose of the Study:
- To investigate the relationship between nerve conduction properties and time since death.
- To identify reliable physiological markers for estimating the post mortem interval.
- To explore a novel method for early post mortem interval determination.
Main Methods:
- Measurement of various nerve conduction properties in rat sciatic nerves.
- Recording nerve properties in vivo during life and ex vivo after death.
- Analysis of property changes over time to identify consistent trends.
Main Results:
- Most measured nerve properties showed inconsistent changes after death.
- The chronaxie of the strength-duration curve for the sciatic nerve increased linearly post mortem.
- This linear increase was observed for the first 90 minutes, reaching a plateau thereafter.
Conclusions:
- The consistent, linear increase in sciatic nerve chronaxie offers a potential new forensic tool.
- This finding could form the basis for a reliable method to determine the early post mortem interval.
- Further research is warranted to validate this method in human subjects.