The objective is to determine if motor cortex stimulation works for the following conditions: 1. Deafferentation facial pain, 2. Upper extremity complex regional pain syndrome (CRPS) and 3. Brachial plexus avulsion or phantom limb pain. Each of these groups of 6 patients (total of 18) will be studied independently and all patients will be implanted with a motor cortex stimulation system. They will be randomised to either a regular or low stimulation setting in the two arms of the study. Each arm will last 3 months.
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Visual Analog scale
Timeframe: 1 month preop, at 12 and 24 weeks postop
SF-36
Timeframe: 1 month preop, at 12 and 24 weeks postop
McGill Pain questionnaire
Timeframe: 1 month preop, at 12 and 24 weeks postop
Beck II depression
Timeframe: 1 month preop, at 12 and 24 weeks postop
Global impression of change
Timeframe: at 12 and 24 weeks postop
Medications log
Timeframe: 1 month preop, at 12 and 24 weeks postop
Employment status
Timeframe: 1 month preop, at 12 and 24 weeks postop