This document discusses ICU psychosis/delirium, which is an acute organic brain syndrome that commonly affects critically ill patients in intensive care units (ICUs). The incidence is reported to be 15-80% of ICU patients, with elderly patients being especially vulnerable. Factors that can predispose patients to ICU psychosis include sensory overload, sleep deprivation, immobilization, stress, unfamiliar environments, and medical conditions/treatments. Symptoms include impaired cognition, disorganized thinking, confusion, and changes in perception or sleep cycles. Diagnosis involves assessments like CAM-ICU or MMSE. Treatment prioritizes managing the underlying causes, while antipsychotics may help control symptoms. Non-drug strategies focus on improving sleep,