Transnasal Ventral Brainstem Epidural Electrical Stimulation Enhances Consciousness in Anesthetized Sheep: A...

Area of Science:

• Neuroscience
• Neurosurgery
• Neuromodulation

Background:

• Disorders of consciousness (DOC) present significant clinical challenges with limited treatment options.
• Current neuromodulation strategies for DOC have shown restricted efficacy.
• Directly targeting the brainstem reticular formation for arousal regulation is technically difficult.

Purpose of the Study:

• To assess the feasibility of transnasal clival epidural stimulation for inducing arousal.
• To investigate the electrocorticographic (ECoG) changes associated with this stimulation technique.
• To explore a novel approach for neuromodulation in disorders of consciousness.

Main Methods:

• Epidural stimulating electrodes were implanted via a transnasal clival approach in three anesthetized sheep.
• Cortical electrodes were placed on the fronto-parietal lobes for electrocorticographic (ECoG) recording.
• Behavioral monitoring and spectral analysis of ECoG data were performed during stimulation.

Main Results:

• The transnasal clival epidural stimulation procedure was technically feasible and safe in all subjects.
• Short-term stimulation successfully elicited observable behavioral signs of arousal.
• ECoG analysis demonstrated a shift in neural activity, with decreased low-frequency power (δ, θ) and increased high-frequency power (β, γ).

Conclusions:

• Transnasal clival epidural stimulation is a technically feasible method for modulating arousal-related neural activity.
• This approach shows promise as a potential therapeutic strategy for disorders of consciousness.
• Further research is needed to optimize electrode design and confirm safety and efficacy in larger studies.