Can post-mortem CT reliably distinguish between drowning and non-drowning asphyxiation?

Area of Science:

• Forensic Radiology
• Medical Imaging
• Pathology

Background:

• Post-mortem computed tomography (CT) is increasingly used in forensic investigations.
• Previous studies suggested specific CT findings indicative of drowning.
• Distinguishing drowning from other causes of asphyxiation is crucial for accurate death investigation.

Purpose of the Study:

• To evaluate the reliability of previously reported post-mortem CT findings in differentiating drowning from other forms of asphyxiation.
• To determine if CT findings can specifically identify drowning as the cause of death.

Main Methods:

• A case-control study involving 14 drowning victims and 11 non-drowning asphyxiation victims.
• Post-mortem CT images were analyzed for specific indicators including fluid in sinuses, airways, lung opacity, diaphragm height, and intracardiac blood density.
• Statistical analysis, including Fisher's exact test and Student's t test, was employed.

Main Results:

• The height of the right hemi-diaphragm was the only significant differentiator between drowning and non-drowning asphyxiation (p=0.045).
• Other evaluated CT findings, such as fluid in airways and lung parenchyma changes, showed no significant difference between the groups.
• The presence of frothy foam and ground-glass opacity was observed in both drowning and non-drowning asphyxiation cases.

Conclusions:

• Post-mortem CT findings are not sufficiently specific to reliably distinguish drowning from other causes of asphyxiation.
• CT indicators for drowning should be interpreted with caution due to their presence in non-drowning asphyxiation cases.
• Further research may be needed to identify more specific CT markers for drowning.