Chained nuclei and python pattern in skeletal muscle cells as histological markers for electrical injury

Area of Science:

• Forensic pathology
• Histopathology
• Electrophysiology

Background:

• Electrical injury causes distinct histopathological changes in skeletal muscle.
• Previous observations include python pattern and chained nuclear change.
• The causative agent (electrical current vs. joule heat) remains debated.

Purpose of the Study:

• To differentiate the causes of python pattern and chained nuclear change in electrical injuries.
• To determine if electrical current or joule heat induces these specific muscle alterations.
• To establish reliable histological markers for forensic electrical injury assessment.

Main Methods:

• In situ application of electrical and heat injury to rat soleus muscle.
• Ex vivo electrical stimulation of soleus muscle in physiological saline.
• Electrical injury exposure in cardiac-arrested rats.

Main Results:

• Both python pattern and chained nuclear change were induced by direct electrical injury.
• Heat injury solely induced the python pattern.
• Chained nuclear change occurred with electrical current in vital tissues, while python pattern appeared post-mortem.
• Python pattern was induced in skeletal muscle post-cardiac arrest.

Conclusions:

• Chained nuclear change is a direct effect of electrical current in living tissues.
• Python pattern is attributed to joule heating, a phenomenon potentially occurring after death.
• These distinct histological changes serve as valuable forensic markers for electrical injury cases.