The highest rates of<unk>  (often 50% to 75% of people) is seen among those who are critically ill in the intensive care unit (ICU) As a result, this was referred to as "ICU psychosis" or "ICU syndrome", terms largely abandoned for the more widely accepted term ICU<unk> . Since the advent of validated and easy-to-implement<unk>  instruments for ICU patients such as the Confusion Assessment Method for the ICU (CAM-ICU) and the Intensive Care<unk>  Screening Checkllist (IC-DSC)., of the hundreds of thousands of ICU patients who develop<unk>  in ICUs every year, it has been recognized that most of them belong to the hypoactive variety, which is easily missed and invisible to the managing teams unless actively monitored using such instruments. The causes of<unk>  in such patients depend on the underlying illnesses, new problems like sepsis and low oxygen levels, and the sedative and pain medicines that are nearly universally given to all ICU patients. Outside the ICU, on hospital wards and in nursing homes, the problem of<unk>  is also a very important medical problem, especially for older patients. The most recent area of the hospital in which<unk>  is just beginning to be monitored routinely in many centers is the Emergency Department, where the prevalence of<unk>  among older adults is about 10%. A systematic review of<unk>  in general medical inpatients showed that estimates of<unk>  prevalence on admission ranged from 10 to 31%. About 5% to 10% of older adults who are admitted to hospital develop a new episode of<unk>  while in hospital. Rates of<unk>  vary widely across general hospital wards. Estimates of the prevalence of<unk>  in nursing homes are between 10% to 45%.
Delirium
Dementia
Excited delirium
Status epilepticus
Ateliosis
Dancing mania
Oneiroid syndrome
Depression of Alzheimer disease