Screening for DSM-IV-TR cognitive disorder NOS in Parkinson's disease using the Mattis Dementia Rating Scale

Area of Science:

• Neurology
• Neuropsychology
• Geriatric Psychiatry

Background:

• Parkinson's disease (PD) is frequently associated with cognitive impairment.
• Accurate screening for cognitive disorders in PD is crucial for timely intervention.
• Cognitive disorder not otherwise specified (NOS) is a common diagnosis in PD, often preceding dementia.

Purpose of the Study:

• To evaluate the diagnostic utility of the Mattis Dementia Rating Scale (MDRS) as a screening tool.
• To determine if the MDRS can effectively identify cognitive disorder NOS in Parkinson's disease patients.
• To assess the MDRS's performance against DSM-IV-TR criteria for cognitive disorder NOS.

Main Methods:

• A cohort of 125 individuals with Parkinson's disease (PD) was assessed.
• Diagnoses of cognitive disorder NOS and dementia were made using DSM-IV-TR criteria.
• Receiver operating characteristics (ROC) analysis was employed to test the discriminant validity of the MDRS, using clinical diagnosis as the gold standard.

Main Results:

• The MDRS demonstrated limited discriminant validity for cognitive disorder NOS in PD.
• The area under the ROC curve was 0.59 (95% CI: 0.43-0.74), indicating poor performance.
• The MDRS was not effective in distinguishing PD patients with cognitive disorder NOS from those without dementia.

Conclusions:

• The Mattis Dementia Rating Scale (MDRS) is not a suitable screening tool for cognitive disorder NOS in Parkinson's disease (PD) patients who do not have dementia.
• The findings suggest a need for alternative or adjunctive screening methods for cognitive impairment in this specific PD subgroup.
• Further validation studies are required to establish reliable screening instruments for early cognitive changes in PD.