Clinical and research interest in delirium has been rising over the last 15 years. The Scottish Intercollegiate Guidelines Network (SIGN) publication on delirium is a state-of-the-art synthesis of the field, and the first UK guideline since 2010. There is new guidance around delirium detection, particularly in recommending the 4 "A"s Test (4AT). The 4AT has the advantage of being brief, embeds and operationalises cognitive testing, and is
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