This document discusses delirium in the ICU, including its definition, categorization, causes, risk factors, diagnosis, monitoring, and treatment approaches. Delirium is an acute confusional state that can fluctuate between hyperactive, hypoactive, and mixed types. It is associated with worse outcomes for ICU patients and increases costs. Risk factors include older age, severity of illness, benzodiazepines use, and infection. Diagnosis involves tools like the ICDSC and CAM-ICU. Treatment focuses on both non-pharmacological measures and pharmacological interventions like haloperidol or atypical antipsychotics.