Fig. 2From: Risk factors for insufficient ultrasound-guided supraclavicular brachial plexus blockBoxplot comparing systolic blood pressure between 41 patients requiring additional local anesthesia and 228 patients not requiring additional local anesthesia as well as comparing 39 patients requiring additional local anesthesia and 39 propensity-matched patients not requiring additional local anesthesia. Asterisk (*) indicates a significant differenceBack to article page