Minimum effective anaesthetic volume of 0.5% ropivacaine for ultrasound-guided popliteal sciatic nerve block in patients undergoing foot and ankle surgery: determination of ED50 and ED95
- Authors
- Jeong, J. S.; Shim, J. C.; Jeong, M. A.; Lee, B. C.; Sung, I. H.
- Issue Date
- Jan-2015
- Publisher
- AUSTRALIAN SOC ANAESTHETISTS
- Keywords
- ropivacaine; sciatic nerve block; ultrasound
- Citation
- ANAESTHESIA AND INTENSIVE CARE, v.43, no.1, pp.92 - 97
- Indexed
- SCIE
SCOPUS
- Journal Title
- ANAESTHESIA AND INTENSIVE CARE
- Volume
- 43
- Number
- 1
- Start Page
- 92
- End Page
- 97
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158142
- DOI
- 10.1177/0310057X1504300114
- ISSN
- 0310-057X
- Abstract
- Compared to nerve stimulation or classic paraesthesia techniques, ultrasound (US)-guided popliteal sciatic nerve block requires a smaller volume of local anaesthetic. The up-and-down method was used to determine the minimum effective anaesthetic volume of 0.5% ropivacaine necessary for US-guided popliteal sciatic nerve block to achieve successful surgical anaesthesia for foot and ankle surgery. The study included 32 patients receiving an US-guided popliteal sciatic nerve bock. The starting dose of 0.5% ropivacaine was set at 30 ml, which was decreased by 3 ml if the block succeeded and increased by 3 ml if the block failed. After the injection of local anaesthetic, the degree of sensory and motor blockade of the tibial and common peroneal nerves was assessed every 5 minutes for 30 minutes. The ED50 and ED95 volumes of local anaesthetic were 6 ml and 16 ml, respectively. The success rates of sensory blockade of the tibial nerve and common peroneal nerve were 69% and 88%, respectively. The success rates of motor blockade of these nerves were 75% and 90%, respectively. The ED50 and ED95 of 0.5% ropivacaine for US-guided popliteal sciatic nerve block were 6 ml and 16 ml, respectively.
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