The role of intra-operative motor evoked potentials in the optimization of chronic cortical stimulation for the treatment of neuropathic pain

Share/Save/Bookmark

Holsheimer, Jan and Lefaucheur, Jean-Pascal and Buitenweg, Jan R. and Cougon, Colette and Nineb, Amine and Nguyen, Jean-Paul (2007) The role of intra-operative motor evoked potentials in the optimization of chronic cortical stimulation for the treatment of neuropathic pain. Clinical Neurophysiology, 118 (10). pp. 2287-2296. ISSN 1388-2457

[img] PDF
Restricted to UT campus only
: Request a copy
371kB
Abstract:Objective: To explore the significance of intra-operative motor evoked potentials (MEPs) obtained by monopolar and bipolar stimulation in determining the electrode location giving most pain relief in chronic motor cortex stimulation (MCS).
Methods: Eight patients with chronic pain were implanted with two arrays of four electrodes each. We measured the peak-peak amplitude (Vp-p) of the MEPs recorded intra-operatively with the same stimulus delivered by each single electrode both anodally and cathodally. Electrodes giving the largest MEPs monopolarly were also tested in bipolar stimulation.
Results: In monopolar stimulation the median amplitude of MEPs evoked anodally was 59% larger than cathodally. The mean amplitude of bipolarly evoked MEPs was only 21% and 37%, respectively, of the corresponding monopoles when the poles were 6 mm and more than 8 mm apart. Significant pain relief was obtained in all 5 patients with a cathode used in chronic stimulation being the anode producing the largest MEP. Conversely, in the 3 patients without pain relief, a cathode used in chronic stimulation was the cathode producing the largest MEPs.
Conclusions: In intra-operative testing stimulation should be monopolar because, contrary to bipolar stimulation, the corresponding MEPs are unambiguously related to a single stimulating electrode. The anode providing the largest MEPs should be selected as the cathode in chronic stimulation. Implantable pulse generators allowing monopolar (cathodal and anodal) stimulation for MCS should become available.
Significance: Intra-operative MEP recordings can predict which electrode should be used as the cathode for the best analgesic effect with chronic MCS.
Item Type:Article
Copyright:© 2007 Elsevier
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/61882
Official URL:http://dx.doi.org/10.1016/j.clinph.2007.07.015
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 241842