“…Hence, the term "never event" was created, with the task of eliminating its incidence. 9 Wrong-sided blocks (WSBs) constitute the most common wrong-side procedure in the perioperative setting, with an incidence in the range of 0.52 to 5.07 WSBs per 10,000 blocks. 10,11 Various factors contribute to errors in regional blocks, such as time pressure, case volume, production demand, inadequate supervision, personnel changes, cognitive error, reliance on memory, incompetence, fatigue, lack of understanding of safety protocol, delays, interruptions, teaching, and intervening procedure.…”