Controlled nerve ablation with direct current: parameters and mechanisms.

Area of Science:

• Neurology
• Neurosurgery
• Regenerative Medicine

Background:

• Spastic hypertonus, characterized by muscle over-activity, frequently occurs post-spinal cord injury or stroke.
• Current treatments like Botulinum toxin A (BtA) and phenol have limitations.
• Previous research indicated direct current (DC) nerve ablation as a potential method for spastic hypertonus management.

Purpose of the Study:

• To investigate optimal direct current (DC) stimulation parameters for clinical application in nerve ablation.
• To evaluate the efficacy and repeatability of DC nerve ablation in animal models of spastic hypertonus.
• To elucidate the underlying mechanisms of DC-induced nerve damage.

Main Methods:

• DC nerve ablation was performed in chronically implanted animal models.
• Animals with decerebrate rigidity (a spastic hypertonus model) were treated with DC.
• Nerve regeneration and functional outcomes were monitored over extended periods.
• Mechanistic studies explored the role of sodium channels and pH changes.

Main Results:

• DC nerve ablation demonstrated significant effectiveness in reducing spastic hypertonus.
• Specific stimulation parameters were identified as more clinically suitable.
• Nerve regeneration was observed in the months following DC ablation.
• The procedure was found to be repeatable, similar to BtA treatments.
• Evidence did not support sodium channel overactivation; pH alteration emerged as the likely mechanism.

Conclusions:

• DC nerve ablation is a viable and effective method for managing spastic hypertonus.
• The repeatability and regenerative potential of DC ablation offer advantages for clinical use.
• Understanding the pH-mediated mechanism is crucial for refining DC nerve ablation techniques.
• Further research into optimal parameters and clinical translation is warranted.