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Putrefactive rigor: apparent rigor mortis due to gas distension

James R Gill1, Kristen Landi

  • 1From the New York City Office of Chief Medical Examiner and Department of Forensic Medicine, New York University School of Medicine, New York, NY.

The American Journal of Forensic Medicine and Pathology
|April 9, 2010
PubMed

Insights

Decomposition gases can cause bloating, mimicking rigor mortis. Forensic investigators must distinguish putrefactive rigor from true rigor mortis to avoid misinterpreting body positioning after death.

Area of Science:

  • Forensic Pathology
  • Biochemistry

Background:

  • Decomposition artifacts can mislead death investigators.
  • Putrefaction, a microbial process, causes odor, discoloration, purge, and bloating.

Observation:

  • Described 3 cases of putrefactive gas distension (bloating).
  • Observed bloating mimicking inappropriate rigor mortis, termed 'putrefactive rigor'.
  • Gas distension caused extremities to extend and lose contact with surfaces.

Findings:

  • Putrefactive gases (methane, hydrogen sulfide, CO2, hydrogen) cause significant bloating.
  • This bloating can create gravity-defying positions mistaken for postmortem movement or true rigor mortis.

Implications:

  • Crucial for medicolegal investigators to differentiate putrefactive rigor from true rigor mortis.
  • Prevents erroneous conclusions of foul play or postmortem repositioning.
  • Enhances accuracy in death investigation and interpretation of postmortem changes.

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