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Nondrowning Asphyxia in Veterinary Forensic Pathology: Suffocation, Strangulation, and Mechanical Asphyxia.

B J McEwen1

  • 1Animal Health Laboratory, University of Guelph, Guelph, Ontario, Canada bmcewen@uoguelph.ca.

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Summary

Forensic asphyxia in animals involves death from oxygen deprivation due to injury. Veterinary pathologists must consider species differences when interpreting animal asphyxia cases, as responses vary from human physiology.

Keywords:
asphyxiachokingforensic pathologyhangingsmotheringstrangulationsuffocationvitiated atmosphere

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Area of Science:

  • Forensic pathology
  • Veterinary pathology
  • Comparative physiology

Background:

  • Asphyxia in forensic contexts signifies death from cerebral anoxia/hypoxia due to injury.
  • Nondrowning asphyxia includes strangulation, suffocation, and mechanical asphyxia, categorized by injury mechanism.
  • Lesions in asphyxia cases may be absent or misattributed, necessitating comprehensive evidence for diagnosis.

Purpose of the Study:

  • To review terminology, classification, mechanisms, and lesions of asphyxial deaths in companion animals.
  • To highlight comparative physiological and anatomical differences in asphyxia responses between animals and humans.
  • To guide veterinary pathologists in accurately interpreting animal asphyxia cases.

Main Methods:

  • Review of forensic literature on asphyxia in humans and animals.
  • Analysis of mechanisms and pathological findings in companion animal asphyxia.
  • Comparative assessment of physiological responses to asphyxia in different species.

Main Results:

  • Asphyxial deaths in animals share mechanisms with humans but exhibit distinct physiological responses.
  • Consciousness duration and onset of death can differ significantly between species due to physiological and anatomical variations.
  • Direct extrapolation from human forensic data to animals may be misleading.

Conclusions:

  • Veterinary pathologists require specialized knowledge to interpret animal asphyxia accurately.
  • Understanding species-specific responses is crucial for determining animal suffering and cause of death.
  • This review provides a foundation for comparative forensic veterinary pathology of asphyxia.