Morphometric investigation of death by asphyxia

Area of Science:

• Forensic Pathology
• Pulmonary Medicine
• Digital Pathology

Background:

• Distinguishing between asphyxial and natural deaths is crucial in forensic pathology.
• Pulmonary morphometry offers a potential quantitative method for such distinctions.
• Previous methods lack objective, quantifiable metrics for differentiating causes of death.

Purpose of the Study:

• To evaluate the efficacy of lung morphometric measurements in distinguishing deaths by asphyxia (hanging, drowning) from natural causes.
• To identify quantifiable differences in pulmonary parenchyma between these groups.
• To assess the utility of computerized image analysis for forensic applications.

Main Methods:

• Analysis of lung parenchyma sections from 27 subjects (14 asphyxia, 13 natural deaths).
• Quantification of pulmonary parenchyma using computerized image analysis to determine positive-fraction areas (PFA) and standard deviations (SD).
• Comparison of morphometric data between groups to identify significant discriminatory features.

Main Results:

• Significant differences in mean PFA distinguished drowned subjects from those with natural deaths (p=0.01).
• Significant differences in SD of PFA distinguished hanged subjects from drowned subjects (p=0.04).
• Subjects who died of natural causes and drowning exhibited greater internal homogeneity than those who hanged.

Conclusions:

• Lung morphometric analysis, specifically PFA and its SD, can aid in differentiating asphyxial deaths from natural deaths.
• This quantitative method shows promise as a complementary tool in forensic pathology.
• Further consideration of factors like senile emphysema is warranted for refined analysis.