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.
- 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.
- ropivacaine; sciatic nerve block; ultrasound
- Issue Date
- AUSTRALIAN SOC ANAESTHETISTS
- ANAESTHESIA AND INTENSIVE CARE, v. 43, NO 1, Page. 92-97
- 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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