APOE ε4 and Memory Among Patients With Heart Failure

Area of Science:

• Neuroscience
• Genetics
• Cardiology

Background:

• Memory loss affects 23-50% of heart failure (HF) patients.
• The apolipoprotein E (APOE) gene, particularly the ε4 allele, is linked to cognitive function.
• Understanding the APOE ε4 allele's role in HF-related memory issues is crucial.

Purpose of the Study:

• To determine the frequency of APOE gene variants in HF patients.
• To assess if APOE ε4 allele presence impacts memory and serum BDNF levels.
• To estimate the effect sizes and confidence intervals of these associations.

Main Methods:

• Pilot study with 29 HF patients (26 completed).
• Measured recall and delayed recall memory at baseline and 12 weeks.
• Collected serum for brain-derived neurotrophic factor (BDNF) analysis at baseline and 8 weeks.

Main Results:

• Seven patients (24.1%) carried the APOE ε4 allele.
• No significant differences in memory or serum BDNF levels were observed between APOE ε4 carriers and non-carriers.
• Effect sizes were small to medium, with low precision indicated by confidence intervals.

Conclusions:

• The APOE ε4 allele did not significantly affect memory or BDNF levels in this pilot HF cohort.
• Larger studies are required to elucidate the interplay between genetic, cognitive, and clinical factors in HF.
• Further investigation into genotypic and neuropsychological variables influencing cognitive training response is warranted.