Fig. 1From: Dose-response studies of Ropivacaine in blood flow of upper extremity after supraclavicular block: a double-blind randomized controlled studyPWD Ultrasound of the brachial artery after brachial plexus block. PS: peak systolic velocity (cm/s.). ED: end-diastolic velocity (cm/s.). TAMAX: time average maximum velocity (cm/s.)Back to article page