Assessment of Long Sensory Tract Conduction in Patients Undergoing Dorsal Root Entry Zone Coagulation for Pain Relief
Cortical somatosensory evoked potentials were recorded pre- and postoperatively, and conducted spinal cord potentials peroperatively, following posterior tibial nerve stimulation in patients undergoing dorsal root entry zone coagulation for pain relief. The majority were cases of brachial plexus avulsion. Cortical SEPs (initially normal in all patients except 2) showed significant deterioration postoperatively in 7 out of 10, correlating with the development of sensory and/or motor deficits in the lower limbs. Conducted spinal cord potentials, however, showed no such deterioration, indicating that the defect was unlikely to have been directly due to the surgical lesions but may have been a consequence of ischaemia or inflammation.
KeywordsBrachial Plexus Cervical Spondylotic Myelopathy Posterior Tibial Nerve Posterior Tibial Nerve Stimulation Dorsal Root Entry Zone
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