Fig. 2From: The Minimum Effective Concentration (MEC95) of different volumes of ropivacaine for ultrasound-guided caudal epidural block: a dose-finding studySequential block results of ultrasound-guided sacral caudal epidural block using ropivacaine 20 ml (A) and 25 ml(B) according to Dixon and Massey up-and-down methodBack to article page