Parasacral sciatic nerve block: does the elicited motor response predict the success rate?
Author(s): Hagon BS, Itani O, Bidgoli JH, Van der Linden PJ Affiliation(s): Department of Anesthesiology, CHU-Brugmann–Huderf, Brussels, Belgium. benedicte.hagon@chu-brugmann.be Publication date & source: 2007-07, Anesth Analg., 105(1):263-6. Publication type: Comparative Study; Randomized Controlled Trial BACKGROUND: In this prospective, randomized, double-blind study, we compared the tibial and the peroneal evoked motor response with regard to efficacy of sciatic nerve block using the parasacral approach. METHODS: Twenty-six ASA I-III patients scheduled for elective lower limb surgery were randomized to receive a parasacral sciatic block, using a nerve stimulator technique seeking either a tibial (n = 14) or peroneal (n = 12) motor response. After the evoked motor response was obtained, a solution of 10 mL 2% lidocaine with epinephrine and 10 mL 0.75% ropivacaine (actual final concentration of epinephrine, 1/160,000) was slowly injected through the needle. Sensory and motor blocks w
