Holby Wiki - Casualty and Holby City
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The Acute Admissions Unit is a short-stay department. It is a gateway between the ED and separate wards. We're all about fast, effective, efficient service.
Eddi McKee describing the department (HC: "Sirens")

The Acute Admissions Unit, or simply AAU, is a short-stay department located on the ground floor of Holby City Hospital. Its purpose is to provide rapid treatment of acute cases that have either been directly admitted to the department or transferred from the emergency department.