Exposure to ambient carbon monoxide and cognitive decrease in a memory clinic.

Area of Science:

• Environmental Health
• Neuroscience
• Public Health

Background:

• Ambient air pollution poses a global health risk.
• Short-term effects of air pollution on cognitive function in neurodegenerative diseases are not well understood.

Purpose of the Study:

• To investigate the association between short-term carbon monoxide (CO) exposure and cognitive changes in older adults with mild cognitive impairment (MCI) or Alzheimer's disease (AD).

Main Methods:

• Utilized data from 717 patients with MCI or AD in South Korea.
• Estimated CO exposure using inverse distance weighting based on residential proximity to air monitoring stations (1 day to 1 month exposure).
• Assessed cognitive performance using the Mini-Mental State Examination (MMSE) and analyzed changes with generalized estimating equations.

Main Results:

• Higher 7-day average CO exposure was associated with lower MMSE scores (RR 0.89).
• The negative impact on cognitive performance was more pronounced in the Alzheimer's disease (AD) group (RR 0.85).
• AD patients were older, less educated, and had lower MMSE scores compared to the MCI group.

Conclusions:

• Short-term CO exposure may worsen cognitive performance in older adults, particularly those with AD.
• Findings suggest ambient air pollutants can impact neurodegenerative processes.
• Public health strategies, including air quality regulations and advisories, are needed to protect vulnerable populations.