This is audio was produced by Hester and Ike during their recent Mersey Video Viva Club session. If you are preparing for your FRCA exams you could consider joining us at https://videovivaclub.com Thanks to them for authoring and electing to share this resource to benefit other anaesthesia trainees preparing for this tough exam. This was filmed in a mock exam environment, please don't rely on this resource in isolation to provide a model answer to this topic.