Effects of hypertension and hypercholesterolemia on cognitive functioning in patients with alzheimer disease

Area of Science:

• Neurology
• Gerontology
• Cardiovascular Medicine

Background:

• Vascular comorbidities (VCs) such as hypertension and hypercholesterolemia are prevalent in Alzheimer disease (AD) patients.
• The impact of VCs on the specific cognitive domains affected in AD requires further elucidation.

Purpose of the Study:

• To investigate the association between vascular comorbidities and the cognitive phenotype in patients diagnosed with Alzheimer disease.
• To determine if the number or severity of VCs correlates with specific cognitive deficits.

Main Methods:

• Seventy-four AD patients were assessed for objective blood pressure and serum cholesterol levels.
• A comprehensive neuropsychological evaluation was performed, assessing attention, memory, language, visuomotor/visuospatial skills, and executive functioning.
• Multiple regression analyses were conducted, controlling for demographic factors, overall cognitive status, and other relevant health conditions like diabetes and cardiac disease.

Main Results:

• An increased number of vascular comorbidities, independent of their severity, was significantly associated with poorer performance in several cognitive areas.
• Specific cognitive deficits linked to VCs included verbal and visual recall, visuoconstructive and spatial analysis, verbal reasoning, and set shifting.
• These findings were observed after controlling for demographic variables and overall cognitive status.

Conclusions:

• Vascular comorbidities are demonstrably linked to specific cognitive impairments in individuals with Alzheimer disease.
• Potential mechanisms include the detrimental effects of VCs on cerebrovascular integrity, such as white matter disruption.
• Effective management of hypertension and hypercholesterolemia is vital for patients diagnosed with AD to mitigate cognitive decline.