Post-mortem development of conjunctival petechiae following temporary prone position.

Area of Science:

• Forensic Pathology
• Postmortem Examination
• Ophthalmology

Background:

• Conjunctival petechiae are vital indicators in forensic examinations, often associated with neck compression.
• However, petechiae can also arise from postmortem blood congestion, such as in a head-down body position.
• The occurrence of petechiae following a short, horizontal prone position remains largely uninvestigated.

Purpose of the Study:

• To determine if a short-term (2-hour) horizontal prone position can induce conjunctival petechiae in the early postmortem period.
• To assess the implications of this finding for forensic case evaluation.

Main Methods:

• Twenty deceased individuals were examined within 12 hours postmortem.
• Bodies were maintained in a horizontal prone position for 2 hours.
• Conjunctival petechiae were documented, and statistical analyses were performed.

Main Results:

• Conjunctival petechiae were observed in 8 out of 20 cases after the prone positioning.
• Significant correlations were found between petechiae development and eyelid examination methods (forceps vs. cotton swab).
• Previous resuscitation attempts also showed a significant correlation with petechiae occurrence.

Conclusions:

• This study provides the first evidence that conjunctival petechiae can develop after short-term postmortem prone positioning.
• Forensic practitioners must consider this phenomenon to avoid misinterpreting petechiae as signs of mechanical neck compression.
• Further research should account for examination techniques and resuscitation history in the context of postmortem petechiae.