A new data-based motor subtype schema for delirium.

Area of Science:

• Geriatric Medicine
• Psychiatry
• Neurology

Background:

• Delirium is a common neuropsychiatric syndrome characterized by acute fluctuations in attention and cognition.
• Motor disturbances, including agitation and retardation, are key features of delirium but subtyping remains challenging.
• Existing psychomotor assessment tools are often lengthy or lack specific validation for delirium.

Purpose of the Study:

• To validate a novel, concise approach for motor subtyping in delirium.
• To develop and assess the Delirium Motoric Checklist (DMC) for differentiating hyperactive and hypoactive delirium subtypes.
• To compare the DMC's performance against existing psychomotor assessment methods.

Main Methods:

• Development of the Delirium Motoric Checklist by combining items from three established psychomotor schemas.
• Principal components analysis (PCA) of DMC items using data from a controlled comparison.
• Validation of identified subtypes against independently assessed motor agitation and retardation in delirious and non-delirious subjects.

Main Results:

• PCA identified two core factors correlating significantly with motor agitation and retardation.
• Subtype criteria were established using symptoms with factor loadings >0.65, resulting in four hyperactive and seven hypoactive items.
• A cutoff of two items was suggested for classifying patients into hyperactive or hypoactive subtypes.

Conclusions:

• The Delirium Motoric Checklist provides a validated, concise, and focused method for motor subtyping in delirium.
• This new approach aids in the objective assessment and classification of psychomotor disturbances in delirium patients.
• The DMC offers a promising tool for clinical and research applications in delirium management.