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195. Effect of clonidine on bupivacaine pharmacokinetic after combined lumbar plexus and sciatic nerve block

Background: Sciatic nerve (SN) block in the popliteal fossa has been used for ankle and foot surgery but is associated with a variable success rate. Since sciatic nerve divides into tibial nerve (TN) and common peroneal nerve (CPN) above the popliteal fossa crease, the tip of the block needle should be positioned before the separation. A cadaver study showed that the division of SN occurs at highly variable distances from the popliteal crease, which is a possible cause for incomplete block of SN. Although recent improvement of ultrasound (US) imaging may help to perform SN block easier, there are no US image studies that describe the anatomical variations of SN. The aim of this study was, therefore, to examine whether US could identify the division of SN and describe the anatomic variations in SN for nerve block.