Studies using composite measurement of cognition suggest that cognitive performance is similar across motor variants of delirium. The authors assessed neuropsychological and symptom profiles in 100 consecutive cases of DSM-IV delirium allocated to motor subtypes in a palliative-care unit: Hypoactive (N=33), Hyperactive (N=18), Mixed (N=26), and No-Alteration motor groups (N=23). The Mixed group had more severe delirium, with highest scores for DRS-R-98 sleep-wake cycle disturbance, hallucinations, delusions, and language abnormalities. Neither the total Cognitive Test for Delirium nor its five neuropsychological domains differed across Hyperactive, Mixed, and Hypoactive motor groups. Most patients (70%) with no motor alteration had DRS-R-98 scores in the mild or subsyndromal range even though they met DSM-IV criteria. Motor variants in delirium have similar cognitive profiles, but mixed cases differ in expression of several noncognitive features.
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