Cognitive profile in mild cognitive impairment with Lewy bodies

Area of Science:

• Neurology
• Cognitive Science
• Geriatrics

Background:

• Mild cognitive impairment (MCI) is a transitional stage between normal aging and dementia.
• Distinguishing between subtypes of MCI, such as MCI with Lewy bodies (MCI-LB) and MCI due to Alzheimer's disease (MCI-AD), is crucial for prognosis and management.
• Previous research indicates overlapping yet distinct cognitive profiles in different MCI subtypes.

Purpose of the Study:

• To elucidate the specific cognitive profile of patients diagnosed with MCI-LB.
• To compare the cognitive performance of MCI-LB patients with that of MCI-AD patients.
• To identify potential cognitive markers for differentiating MCI-LB from MCI-AD.

Main Methods:

• Recruited 60 patients with probable MCI-LB and 60 patients with probable MCI-AD, all over 60 years old.
• Administered the Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) to assess global cognitive function.
• Analyzed performance on specific subtests related to visuoconstruction, executive function, and memory.

Main Results:

• No significant differences were found in overall MMSE and MoCA scores between MCI-LB and MCI-AD groups.
• MCI-LB patients exhibited significantly lower scores in visuoconstructive tasks (e.g., clock-drawing test) and executive function tests (e.g., animal fluency, digit backward recall).
• MCI-AD patients showed lower scores in specific memory recall tasks compared to MCI-LB patients.

Conclusions:

• The study delineates the cognitive profile of MCI-LB, characterized by impairments in visuoconstruction and executive functions.
• These findings align with the known cognitive characteristics of Dementia with Lewy Bodies.
• Memory functions appear relatively preserved in the early stages of MCI-LB compared to MCI-AD.