University Hospital of Bonn (UKB) Feb 20 2026 Delirium is a sudden onset of acute confusion in which those affected are disoriented, have impaired attention, and experience altered perception -often accompanied by hallucinations or sleep disturbances. In cardiology, it is one of the most common but also one of the most underestimated complications. Older patients who have undergone cardiac surgery or interventional procedures are particularly affected. A new international state-of-the-art