• Paul Ellis Marik


Delirium is defined in the American Psychiatric Associations Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) as a disturbance of consciousness and cognition that develops over a short period of time (hours to days) and fluctuates over time.1 Many different terms have been used to describe the syndrome of cognitive impairment in critically ill patients, including ICU psychosis, acute confusional state, ICU encephalopathy, and acute brain syndrome; however, ICU delirium is the preferred term. Delirium is a very common and serious complication in ICU patients.2–5 McNicoll et al.6 reported that 70.3% of elderly ICU patients developed delirium at some time during their hospitalization. Delirium in ICU patients has been demonstrated to be an independent predictor of the length of hospital stay as well as ICU and 6-month mortality rates.2–5,7,8 In addition, delirium may be a predictor of long-term cognitive impairment in survivors of critical illness.


Postoperative Delirium Wake Cycle Bright Light Therapy Acute Confusional State Delirium Assessment 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Division of Pulmonary and Critical Care MedicineEastern Virginia Medical SchoolNorfolkUSA

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