[Finite-element simulation of ethanol diffusion in nonencapsulated subdural hematomas]

Area of Science:

• Biomedical Engineering
• Forensic Science
• Toxicology

Context:

• Subdural hematomas (SDHs) are critical medical conditions.
• Understanding ethanol diffusion in SDHs is vital for forensic toxicology.
• Nonencapsulated SDHs present unique diffusion dynamics.

Purpose:

• To determine the diffusion regularities of ethanol within nonencapsulated subdural hematomas.
• To model ethanol concentration fields using finite-element analysis.
• To investigate factors influencing ethanol distribution in SDHs.

Summary:

• Developed a 2D finite-element model for ethanol diffusion in SDHs.
• Ethanol diffusion is governed by initial concentration, ethanolemia, hematoma geometry, and tissue diffusion properties.
• Ethanol can diffuse into non-alcoholic hematomas from surrounding tissues.
• The central hematoma region exhibits the highest ethanol concentration stability.

Impact:

• Recommends interpreting postmortem ethanol concentrations in diffusion-resistant areas as minimum ethanolemia levels during hematoma formation.
• Provides a model for estimating in-vivo ethanol levels in forensic investigations.
• Enhances understanding of ethanol pharmacokinetics in traumatic brain injury contexts.