Mild cognitive impairment in moderate to severe COPD: a preliminary study

Area of Science:

• Neurology
• Pulmonology
• Psychology

Background:

• Cognitive impairment is common in Chronic Obstructive Pulmonary Disease (COPD).
• The prevalence and screening methods for Mild Cognitive Impairment (MCI) in COPD patients remain largely unaddressed.
• This study investigates MCI in COPD and evaluates cognitive screening tools.

Purpose of the Study:

• Determine the frequency and subtypes of MCI in COPD patients.
• Assess the diagnostic validity of the Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) for MCI in COPD.
• Identify the most effective screening tool for MCI in this population.

Main Methods:

• A comprehensive neuropsychological assessment was performed on 45 moderate-to-severe COPD patients and 50 healthy controls.
• Standard criteria were used to diagnose MCI.
• Receiver operating characteristic (ROC) curves were analyzed to evaluate the MMSE and MoCA performance.

Main Results:

• MCI was diagnosed in 36% of COPD patients versus 12% of controls.
• The predominant MCI subtype in COPD patients involved nonamnestic single-domain impairment, particularly affecting attention and executive functions.
• The MoCA demonstrated superior validity, with an optimal cutoff of 26 (81% sensitivity, 72% specificity). The MMSE showed no acceptable validity.

Conclusions:

• A significant percentage of COPD patients exhibit MCI, a potential precursor to dementia.
• Further longitudinal studies are required to understand the progression of cognitive and functional decline in these patients.
• The MoCA is a more effective screening tool for MCI in COPD patients compared to the MMSE.