“…Systematic reviews and meta-analyses of randomized controlled trials (RCTs) demonstrate that ultrasound-guided techniques improve outcomes (faster block performance, fewer needle passes, reduced incidence of vascular puncture, faster sensory block onset, and success rate) when compared with traditional techniques. [1][2][3][4][5][6] Limitations of existing RCTs comparing ultrasound guidance with traditional techniques included having operators with a wide range of expertise, including both consultant and trainees performing the intervention. The authors of a 2015 review noted that, currently, there are no high-quality randomized studies that evaluate the learning of ultrasound-guided peripheral nerve blockade by novices.…”