“…Occurrences may only be highlighted by coronial or media reports, and it is likely not all cases are reported. The number of these reports in recent years clearly indicates that preventable events occur regularly and are an international problem [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. In the 4th National Audit Project (NAP4) of the Royal College of Anaesthetists and Difficult Airway Society, nine cases of unrecognised oesophageal intubation were reported [ 42 , 43 ]: three during anaesthesia for surgery, four in the intensive care unit (ICU) and two in emergency departments.…”