Motor cortex stimulation for neuropathic pain

Area of Science:

• Neurosurgery
• Pain Management
• Neurology

Background:

• Epidural motor cortex stimulation (MCS) has emerged as a surgical treatment for refractory neuropathic pain since 1991.
• Its precise mechanism of action remains incompletely understood, necessitating further research.
• Optimal patient selection criteria and predictive value of diagnostic tests for MCS efficacy are not yet established.

Purpose of the Study:

• To review the literature on epidural motor cortex stimulation for central and neuropathic pain over the past 15 years.
• To discuss the technical advancements and challenges in patient selection and electrode placement.
• To evaluate the efficacy of MCS for various pain conditions and identify factors influencing outcomes.

Main Methods:

• Literature review of studies published over the last 15 years concerning central and neuropathic pain treated with MCS.
• Analysis of factors influencing MCS efficacy, including patient selection, surgical technique, and stimulation parameters.
• Discussion of current and future research directions, including multicentered randomized trials.

Main Results:

• MCS is a potential treatment of choice for post-stroke pain, thalamic pain, and facial anesthesia dolorosa.
• For brachial plexus avulsion pain, dorsal root entry zone (DREZ)-tomy is preferred initially, with MCS as a secondary option.
• MCS shows promising results for phantom limb pain, contingent on precise electrode placement and optimized stimulation programming.

Conclusions:

• Accurate electrode placement and sophisticated stimulation programming are critical for successful MCS outcomes.
• Further research, particularly multicentered randomized studies, is needed to elucidate MCS mechanisms and refine clinical applications.
• Understanding MCS mechanisms will enable better adjustment of stimulation parameters for improved patient management.