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As the use of ultrasound for regional anesthesia has increased, many studies have examined the distribution of local anesthetic and the location of the needle tip. Nevertheless, the relationship between motor stimulation threshold and distribution of local anesthetic is unclear. The aim of this study was to compare block onset time, distribution of local anesthetic, and location of the needle tip at two different motor stimulation thresholds, i.e., 0.2 and 0.5 mA, used in combination with ultrasound guidance.

canadian journal of anaesthesia/canadian journal of anesthesia

A comparison of motor stimulation threshold in ultrasound-guided interscalene brachial plexus block for arthroscopic shoulder surgery: a randomized trial