• Porntipa Pasuhirunnikorn, Teerachat Tanasansomboon, Weerasak Singhatanadgige, Wicharn Yingsakmongkol, and Pornpan Chalermkitpanit.
• Department of Anesthesiology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand.
• World Neurosurg. 2023 Jul 1; 175: e662e668e662-e668.

ObjectiveThis study evaluated the effect of prolonged concordant response and functional clinical improvement between lidocaine and bupivacaine for cervical medial branch block (CMBB) in chronic cervical facet syndrome.MethodsSixty-two patients diagnosed with chronic cervical facet syndrome were randomized into either lidocaine or bupivacaine groups. The therapeutic CMBB was performed under ultrasound guidance. Either 2% lidocaine or 0.5% bupivacaine with a volume of 0.5-1 mL per level was injected according to the patient's pain symptoms. The patients, pain assessor, and pain specialist were blinded. The primary outcome was the duration of pain reduction by at least 50%. The Numerical Rating Scale of 0-10 and the Neck Disability Index questionnaire were recorded.ResultsThere was no significant difference in the duration of 50% and 75% pain reduction and Neck Disability Index between the lidocaine and bupivacaine groups. Lidocaine provided significant pain reduction up to 16 weeks (P < 0.05) and significant improvement in neck functional outcomes up to 8 weeks (P < 0.01) compared to the baseline. While bupivacaine yielded significant pain alleviation for up to 8 weeks for pain upon neck mobilization (P < 0.05) and demonstrated notable improvement in neck function up to 4 weeks (P < 0.01) compared to the baseline.ConclusionCMBB using lidocaine or bupivacaine provided clinical benefits in prolonged analgesic effect and improving neck functions for chronic cervical facet syndrome. Lidocaine illustrated better performance and could be considered a local anesthetic of choice regarding the prolonged concordance response.Copyright © 2023 Elsevier Inc. All rights reserved.

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