The 4AT is a brief bedside assessment tool used for the rapid initial detection of delirium and cognitive impairment in clinical settings. It takes less than 2 minutes to administer and consists of 4 items: Alertness, AMT4 (Abbreviated Mental Test – 4), Attention (Months Backwards test), and Acute change or fluctuating course. A key feature is that it does not require special training to use.
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