Total cerebral blood flow in relation to cognitive function: the Rotterdam Scan Study

Area of Science:

• Neurology
• Neuroimaging
• Cognitive Science

Background:

• Cerebral hypoperfusion is a known risk factor for cognitive decline.
• The relationship between cerebral blood flow (CBF) and cognitive performance requires further elucidation, particularly concerning the influence of brain volume.

Purpose of the Study:

• To investigate the association between total cerebral blood flow (tCBF) and cognitive function.
• To determine if this association is independent of brain volume in an older adult population.

Main Methods:

• Utilized magnetic resonance imaging (MRI) to measure tCBF and brain volume.
• Analyzed data from 892 participants aged 60-91 years from the Rotterdam Scan Study.
• Assessed cognitive function including information-processing speed, executive function, and global cognition.

Main Results:

• Lower tCBF was significantly associated with poorer performance in information-processing speed, executive function, and global cognition.
• After adjusting for brain volume, the associations between tCBF and cognitive measures were no longer significant.
• These findings suggest that brain atrophy may mediate or confound the observed relationship.

Conclusions:

• The association between cerebral blood flow and cognitive function in older adults may be largely explained by brain atrophy.
• Future research on cerebral blood flow and cognition should account for brain volume changes or brain atrophy.