Management of Psychosis in Parkinson’s Disease: Emphasizing Clinical Subtypes and Pathophysiological Mechanisms of the Condition

Table 3

Features of delirium versus psychosis in PD.

Features	Delirium	Psychosis
Onset	Acute	Insidious
Course	Fluctuating, usually resolving over days to weeks	Progressive
Conscious level	Often impaired; can fluctuate rapidly; can be drowsy or hyperaroused	Clear
Cognitive defects	Poor short-term memory, poor attention span	Subtle
Hallucinations	Common, especially visual	Common especially complex visual or auditory
Key symptoms	Inattention, thought disorganisation, day-night reversal	Hallucinations, delusions, thought insertion, withdrawal or broadcast, passivity phenomena, phantom boarder
Medical status	Abnormal	Normal

Reference: Vardy et al., 2015 [58].