Minimum Effective Anaesthetic Volume of Ropivacaine 0.5% for Sciatic Nerve Block in Arthroscopic Knee Surgeries
Journal Title: Journal of Anesthetic Research and Pain Medicine - Year 2017, Vol 2, Issue 1
Abstract
Ultrasound and nerve-stimulation guidance (double-guidance) may help to exactly locate the injection and minimize the amount of local anaesthetics required. This clinical investigation aimed to estimate the minimum effective anaesthetic volume (MEAV) of ropivacaine 0.5% required to block the sciatic nerve at the subgluteal injection under double-guidance for arthroscopic knee surgery. The Dixon and Massey up-and-down sequential method was used to determine the MEAV of ropivacaine 0.5% necessary for double-guided subgluteal sciatic nerve block. This study included 26 patients between the ages of 18 and 48 years old. The starting dose was set at 16ml, which was decreased by 1.0ml if the block succeeded and increased by 1.0ml if the block failed. After the injection of local anaesthetic, sensory and motor function of the tibial and common peroneal nerve were assessed by a blinded observer every 5 minutes for 35 minutes. It was demonstrated that effective volume in 90% of cases (EV90) of ropivacaine 0.5% was 13.0 ml (95% CI 12.6–15.0). The 50% effective volume (EV50) of ropivacaine 0.5% was 12.3ml (95% CI 11.8–12.8). Therefore, perineural injection of ropivacaine 0.5% 13.0ml could provide successful subgluteal sciatic nerve block in 90% of patients undergoing arthroscopic knee surgery.
Authors and Affiliations
Daping Wang, Zhiheng Liu, Mingfang Xiang, Nanbo Luo, Songshan Li, Shaonong Huang, Weimin Zhu, Wei Lu
Keywords
Related Articles
- EP ID EP248995
- DOI 10.28967/jarpm.2017.01.17005
- Views 117
- Downloads 0
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