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  • Title: Cervical plexus anesthesia for carotid endarterectomy: comparison of ropivacaine and mepivacaine.
    Author: Leoni A, Magrin S, Mascotto G, Rigamonti A, Gallioli G, Muzzolon F, Fanelli G, Casati A.
    Journal: Can J Anaesth; 2000 Feb; 47(2):185-7. PubMed ID: 10674516.
    Abstract:
    PURPOSE: To evaluate the effectiveness of cervical plexus block performed with ropivacaine 0.75% or 1%, or mepivacaine 2%. METHODS: In a prospective, randomized, double-blind study, 60 patients received deep cervical plexus block with 0.2 ml x kg(-1) divided among C2-C4 injections using ropivacaine 0.75% and 1% or mepivacaine 2%. A blinded observer recorded loss of pin-prick sensation every minute in the C2-C4 dermatomes until readiness for surgery. Then, a superficial cervical block was performed with 0.15 ml x kg(-1) lidocaine 1%. The need for intraoperative supplemental analgesia and degree of pain and time of first postoperative pain medication were also recorded. RESULTS: General anesthesia was not required to complete surgery in any case. No differences in the need for intraoperative supplemental analgesia was observed (7, 6, and 9 patients with ropivacaine 0.75% and 1% or mepivacaine 2%, respectively). Readiness to surgery required 15 (10-25) min with ropivacaine 0.75%, 18 (8-20) min with ropivacaine 1%, and 15 (5-20) min with mepivacaine 2% (P = NS); while patients asked for first postoperative pain medication after 10 (4-13) hr and 9 (6.5 - 11) hr with ropivacaine 0.75% and 1% compared with 5 (0-8) hr with mepivacaine 2% (P<0.05). CONCLUSION: Ropivacaine 0.75% or 1% are appropriate choices when performing cervical plexus anesthesia for carotid endarterectomy, providing nerve block characteristics similar to those of mepivacaine 2%, but with the advantage of longer postoperative pain relief.
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