True about delirium are all except: (A) Preserved attention, (B) Disturbed sleep, (C) Disorientation, (D) Hallucination
Answer is A. Delirium is characterized by an acute decline in both the level of consciousness and cognition with paicular impairment in attention. A life threatening, yet potentially reversible disorder of the central nervous system (CNS), delirium often involves perceptual disturbances, abnormal psychomotor activity, and sleep cycle impairment. Reference: Kaplan & Sadock's Synopsis of Psychiatry: Behavioral Sciences/Clinical Psychiatry, 11th Edition, page 697.