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Chronic precentral stimulation in trigeminal neuropathic pain
1Neurosurgical Department, Justus-Liebig-University, Giessen, Federal Republic of Germany.
Acta Neurochirurgica
|January 1, 1996
Summary
Motor-cortex stimulation shows promise for severe trigeminal neuropathic pain, offering initial relief in most patients. However, long-term efficacy varies, with sustained pain control achieved in only half of the cases studied.
Area of Science:
- Neurosurgery
- Neurology
- Pain Management
Background:
- Deep Brain Stimulation (DBS) offers limited long-term relief for deafferentation pain syndromes.
- Trigeminal neuropathic pain (TNP) conditions like dysesthesia, anesthesia dolorosa, and postherpetic neuralgia present significant treatment challenges.
Observation:
- This study investigated Motor-Cortex Stimulation (MCS) in seven patients with severe TNP.
- Test stimulation preceded impulse-generator implantation in all but one case, with success defined as >50% pain reduction (Visual Analogue Scale).
- Most patients experienced pain inhibition below the motor threshold, with initial good to excellent pain relief.
Findings:
- Three out of six patients maintained good to excellent pain control for 5 months to 2 years.
- The positive effects of MCS diminished over several months in the remaining three patients.
- One patient experienced a focal seizure during test stimulation, but no other operative complications occurred.
Implications:
- Motor-cortex stimulation is a viable option for severe trigeminal neuropathic pain, offering initial pain reduction.
- Further research is needed to optimize MCS techniques for sustained long-term pain relief in TNP.
- MCS may be a valuable alternative when other treatments fail, despite variable long-term outcomes.