Forensic diagnosis of death from cold

Area of Science:

• Forensic Pathology
• Environmental Medicine
• Toxicology

Background:

• Accurate forensic diagnosis of hypothermia is crucial.
• Understanding postmortem changes aids in determining cause of death.
• Previous studies have not fully elucidated specific indicators.

Purpose of the Study:

• To clarify forensic diagnostic methods for hypothermia.
• To analyze postmortem changes in hypothermia cases.
• To identify reliable indicators of fatal hypothermia.

Main Methods:

• Retrospective analysis of 211 hypothermia cases (1990-1999).
• Evaluation of postmortem rectal temperature decrease rates based on ambient temperature.
• Assessment of blood color differences between heart chambers.
• Documentation of gastric/duodenal submucosal bleeding (Wishnewski's spots).
• Observation of paradoxical undressing.

Main Results:

• Postmortem cooling rates were 2.3°C, 2.7°C, and 3.6°C per hour at ambient temperatures ≥0°C, 0°C to -10°C, and <-10°C, respectively.
• Blood color differences between heart chambers were observed in 33.6% of inquest cases and 87.0% of autopsy cases, aiding diagnosis.
• Gastric or duodenal submucosal bleeding (Wishnewski's spots) occurred in 43.5% of autopsy cases.
• Paradoxical undressing was noted in 21.3% of inquest cases.

Conclusions:

• Postmortem cooling rates are temperature-dependent and useful for estimating time since death.
• Blood color discrepancies and gastric bleeding are significant indicators for diagnosing fatal hypothermia.
• Paradoxical undressing is a notable behavioral change in some hypothermia fatalities.