ABNORMALITIES PRODUCED IN THE CENTRAL NERVOUS SYSTEM BY ELECTRICAL INJURIES.

Area of Science:

• Neurology
• Electrophysiology
• Histopathology

Background:

• Electrical currents are used in various medical and experimental procedures.
• Understanding the neuropathological effects of different electrical current types is crucial.

Purpose of the Study:

• To investigate and compare the neuropathological effects of alternating current (AC) and continuous current (DC) on the central nervous system.
• To determine the voltage-dependent severity of neural damage and identify susceptible cell types.

Main Methods:

• Experimental application of AC and DC at varying voltages (110-1000V) to animal models.
• Histopathological examination of central nervous system tissues, focusing on nerve cell morphology and cellular damage.
• Identification of specific lesion types, including hemorrhages and cellular abnormalities.

Main Results:

• AC shocks frequently caused hemorrhages, while DC shocks resulted in fewer hemorrhages.
• Both AC and DC at higher voltages (500-1000V) induced severe nerve cell abnormalities, more pronounced with DC.
• Purkinje cells in the cerebellum were identified as the most susceptible to electrical injury.
• Cerebral and cerebellar cortical damage, including cavitation, occurred near the electrode site.
• Lower voltages (110-220V) caused less severe cellular changes, with hemorrhages more common in the AC group.

Conclusions:

• AC and DC produce distinct neuropathological lesion patterns in the central nervous system.
• Nerve cell death criteria include uniformly staining, shrunken, pyknotic nuclei.
• Electrical injury severity is voltage-dependent, with higher potentials causing more significant damage.
• At lower voltages, respiratory block may be the primary cause of death rather than direct cellular demise.