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Related Experiment Videos

Postmortem stability and interpretation of beta 2-agonist concentrations.

F J Couper1, O H Drummer

  • 1Victorian Institute of Forensic Medicine, Department of Forensic Medicine, Monash University, Southbank, Australia.

Journal of Forensic Sciences
|July 17, 1999
PubMed
Summary

Beta 2-agonists like salbutamol are stable in postmortem blood, suggesting concentrations reflect levels at death. However, fenoterol degrades rapidly, making its postmortem stability questionable for accurate interpretation in asthma fatalities.

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Area of Science:

  • Forensic Toxicology
  • Pharmacology
  • Clinical Chemistry

Background:

  • Beta 2-agonists are crucial in asthma management.
  • Understanding their stability and redistribution in postmortem samples is vital for interpreting their role in asthma deaths.

Purpose of the Study:

  • To assess the stability of common beta 2-agonists (salbutamol, terbutaline, fenoterol) in postmortem blood.
  • To investigate the potential for postmortem redistribution of salbutamol.

Main Methods:

  • Stability studies of salbutamol, terbutaline, and fenoterol in postmortem blood at various temperatures (-20°C, 4°C, 23°C) over extended periods.
  • Comparison of salbutamol concentrations in blood samples taken at mortuary admission versus autopsy (45 hours later).

Main Results:

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  • Salbutamol and terbutaline demonstrated good stability in postmortem blood across tested conditions.
  • Fenoterol exhibited significant degradation, with losses ranging from 66% to 93% depending on temperature.
  • No significant difference in salbutamol concentrations was observed between early and later postmortem blood samples, indicating minimal redistribution.

Conclusions:

  • Salbutamol and terbutaline concentrations in postmortem blood are likely representative of in vivo levels at the time of death.
  • Fenoterol's poor stability in postmortem samples raises concerns about its reliable quantification and interpretation in forensic investigations.
  • These findings are critical for accurately assessing the involvement of beta 2-agonists in cases of asthma mortality.