Vascular cognitive impairment (VCI) is a common cause of memory and thinking problems due to reduced blood flow to the brain. A new meta-analysis combined data from 18 studies involving 682 VCI patients and 643 healthy controls to identify patterns of brain atrophy.
The analysis revealed that brain shrinkage in VCI patients converges on two key brain networks: the somatomotor network, which controls movement, and the salience network, which helps focus attention. This suggests VCI may be a "disconnection syndrome" where these networks are disrupted.
Further analysis linked the atrophy to specific types of brain cells, particularly layer 6 corticothalamic and subcortical projection neurons. The pattern of damage also matched the distribution of dopamine and serotonin transporters, chemicals important for mood and cognition.
These findings provide new targets for potential treatments aimed at protecting these vulnerable networks and cell types. However, the study shows associations, not cause and effect. More research is needed to confirm these links and develop therapies.
