Population
The study was conducted over one working day at the City and Sandwell Hospitals in the West Midlands region of the United Kingdom. Thirty Intensive Care Unit (ICU) and operating theatre (OT) doctors and nurses who assist or carry out rapid sequence induction (RSI) as part of their job role were eligible to participate and recruitment was according to convenience sampling and direct approach (Figure 4). Information on job roles and previous experience of applying cricoid pressure was collected. All participants were required to have previously carried out cricoid pressure on a patient.