“…19,25,29,32,33,35,51,53,55 Fifteen (22%) practitioners adopted ENS, 12,16,22,24,29,31,41,44 whereas intermittent aspiration before injection was reported in 22 cases of LA administration for peripheral nerve block. 8,11,15,16,18,19,22,24,25,27,[31][32][33]36,38,41,43,46,58 Finally, only 1 author reported on the concomitant use of ultrasound, ENS, and intermittent aspiration 29 in a patient who developed toxicity 10 minutes after LA injection.…”