Factors Determining Cognitive Dysfunction in Cerebral Small Vessel Disease

Area of Science:

• Neurology
• Genetics
• Geriatrics

Background:

• Vascular dementia involves cognitive decline from cerebrovascular injury.
• Small vessel disease (SVD) is common in older adults, but not all develop dementia.
• Identifying factors predicting dementia progression in SVD is crucial for targeted interventions.

Purpose of the Study:

• To investigate genetic and non-genetic factors associated with cognitive impairment in patients with radiological SVD.
• To determine if specific comorbidities or CYP11B2 gene polymorphisms predict the conversion of SVD-related white matter changes to dementia.

Main Methods:

• A prospective study included 210 patients meeting SVD criteria.
• Data collected included medical comorbidities, demographics, substance abuse, and neuropsychological evaluations.
• Genetic testing for CYP11B2 polymorphisms (TT, TC, CC alleles) was performed.

Main Results:

• Hypertension and hyperhomocysteinemia significantly correlated with white matter changes severity.
• No significant correlation was found between cognitive dysfunction and white matter changes severity or CYP11B2 genotypes.
• TC genotype was more prevalent in male hypertensives; however, no studied factor predicted leukoaraiosis progression to dementia.

Conclusions:

• While hypertension and hyperhomocysteinemia are linked to white matter changes in SVD, they do not appear to drive the progression to vascular dementia.
• CYP11B2 gene polymorphisms (TT, TC, CC) were not found to be determinants in the conversion of leukoaraiosis to dementia.