Exploring performance of, and attitudes to, Stop‐ and Mock‐Before‐You‐Block in preventing wrong‐side blocks

We conducted an online survey to assess the career experiences of wrong side blocks, the practice of Stop-Before-You-Block, the recently described method of Mock-Before-You-Block and attitudes to these. Respondents were 208 anaesthetists across nine hospitals (173 consultants or Staff and Associate Specialist doctors'), representing 3623 years of collective anaesthetic practice. There had been a total of 62 wrong side blocks (by 51 anaesthetists and one current trainee). Predisposing factors for this were commonly ascribed to distractions (35 (69%), for example due to rushing or teaching), patient positioning (9 (18%)) or miscommunication (6 (12%)). Two (4%) respondents felt they had performed Stop-Before-You-Block too early; 62 (41%) of all respondents stated they performed Stop-Before-You-Block as early as preparing the skin or on arrival of the patient in the anaesthetic room, and not any later. Twenty (10%) respondents admitted to not performing Stop-Before-You-Block at all or only occasionally (including 5 (2%) who had performed a wrong side block). Mock-Before-You-Block was easily understood (by 169 out of 197 (86%)) and 14 out of 61 (23%) respondents felt it would have prevented the wrong side error in their case. However, free-text comments indicated that many anaesthetists were reluctant to use a method that interrupted their performance of the block. We conclude that considerable work is needed to achieve full compliance with Stop-Before-You-Block at the correct time.