Central Neuropathic Pain and Complex Regional Pain Syndrome Following Brachial Plexus Injury Treated Successfully With Dorsal Root Entry Zone Lesioning

Abstract

Abstract INTRODUCTION Central neuropathic pain (CNP) and complex regional pain syndrome (CRPS) present as chronic, unrelenting, and disabling pain resulting from central and peripheral nervous system injuries. For patients who have failed conservative management, dorsal root entry zone (DREZ) lesioning may serve as an alternative for the management of intractable pain. METHODS A 36-yr-old male presented with complete right brachial plexus injury and avulsion of nerve roots following a motorcycle accident. He developed disabling type I CRPS of the right upper extremity. After failing medical therapy, he underwent a trial of conventional SCS using 2 percutaneous leads in the upper cervical spine but did not get topographical coverage. He underwent a second SCS trial with the placement of a paddle lead using burst therapy, but his initial partial pain relief subsided after 3 d. Subsequently, he underwent SCS removal, C2 to T1 right DREZ lesioning, and C4 to T1 laminoplasty. The patient gained a significant pain relief and became more functional. Five months postoperatively, he experienced an improvement in his pain and narcotic consumption. RESULTS Using an insulated neurotomy electrode, 2-mm-deep lesions were made at 75°C for 15 s. A total of 83 lesions were made from T2 to C3. Each lesion was spaced 1 mm apart. The impedance was less than 1000 ohms, which was consistent within an area of injury. Somatosensory and motor-evoked potentials were at baseline during the case without significant changes. CONCLUSION When SCS fails, lesioning of the dorsal root entry zone is a useful tool in the armamentarium for the management of refractory brachial plexus neuropathic pain.