Anaesthesia
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To assess the degree to which cricoid pressure (Sellick manoeuvre) actually compresses the oesophagus, we measured the effect of cricoid pressure and paralaryngeal pressure on the outer anteroposterior diameter of the upper oesophagus with ultrasound in 39 healthy volunteers. The mean (SD) outer anteroposterior oesophageal diameter was 0.77 (0.11) cm with no pressure, 0.79 (0.13) cm with the application of cricoid pressure of 30 N and 0.68 (0.12) cm with the application of paralaryngeal pressure of 30 N (p < 0.0001). If cricoid pressure does not reduce the anteroposterior diameter of the oesophagus, it is difficult or impossible to explain the efficacy of the Sellick manoeuvre. However, paralaryngeal pressure decreases this diameter and has the potential to occlude the upper oesophagus.
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We analysed 1743 patient safety incidents reported between 2004 and 2014 from critical care units in England and Wales where the harm had been classified as 'severe' (1346, 77%) or 'death' (397, 23%). We classified 593 (34%) of these incidents as resulting in temporary harm, and 782 (45%) as more than temporary harm, of which 389 (22%) may have contributed to the patient's death. ⋯ There were changes over time for some incident types (pressure sores: 10 incidents in 2007, 64 in 2012; infections: 60 incidents in 2007, 10 in 2012) and some changes in response to national guidance. We made a comparison with a dataset of all incidents reported from units in North-West England, and this confirmed that the search strategy identified more severe incidents, but did not identify all incidents that contributed to mortality.