Sotthisopha T, et al. – Researchers undertook this dose–finding study to explore the minimum effective volume in 90% of patients (MEV90) of lidocaine 1.5% with epinephrine 5 μg/mL for ultrasound–guided costoclavicular block. As per their observations, the MEV90 of lidocaine 1.5% with epinephrine 5 μg/mL, for ultrasound–guided costoclavicular block, was 34 mL.