Brain Alterations and Cognitive Impairment in Older Adults With Heart Failure

Cognitive impairment, commonly reported as difficulty with memory and executive function, is a widely recognized clinical challenge for persons > 65 years old with HF. Although the degree of cognitive impairment usually does not meet the criteria for dementia, it can affect an individual's ability to process and remember information, such as complex medication regimens [5]. Findings suggest that brain regions that support memory (i.e. temporal lobe) and executive function (i.e. prefrontal cortex) may be altered in older persons with HF; suggesting that these brain alterations are related to the HF disease process and not normal aging. Surprisingly, despite the high prevalence of cognitive impairment in HF, relationships between brain and cognition have not been well studied.

Little is known about the relationships between brain magnetic resonance imaging (MRI) and cognitive impairment in older persons with HF. A limited number of studies have investigated brain MRI in adults with HF and produced conflicting results. Three studies utilized structural MRI techniques and identified evidence of atrophy in the temporal lobe, hippocampus, and prefrontal cortex and an increased volume of white matter hyperintensities [6-8]. Brain hypoperfusion, operationalized as decreased global cerebral perfusion, was identified in two studies [9, 10]. Only one study examined relationships between brain MRI and cognitive impairment in HF [6]. Vogels et al., (2007) found that atrophy in the medial temporal lobe was associated with decreased measures of memory and executive function. White matter hyperintensities did not correlate with any cognitive measures. Limited research findings indicate that various brain alterations in the temporal lobe, hippocampus, and prefrontal cortex contribute to cognitive impairment in HF. However, previous findings are limited by use of lower resolution scanners (1.5 Tesla), lack of MRI techniques (i.e. structural and perfusion scans) and recruitment of mixed age samples.

Based on these limitations, the purpose of this research plan is to explore relationships between brain MRI and cognitive impairment in older persons with HF using high resolution structural and perfusion scans. To accomplish this goal, investigators will compare 40 adults with HF who are > 65 years old with 40 healthy, gender, age, and education matched controls. Investigators will obtain neuropsychological measures of multiple domains, as well as MRI measurements of the temporal lobe and prefrontal cortex at baseline and 12-months. The following specific aims will be investigated:

Aim 1: Compare brain MRI in older persons with HF and controls at baseline and 12-months.

Hypothesis 1a: Older persons with HF will have increased white matter hyperintensities, decreased grey matter volume, and decreased perfusion in the temporal lobe and prefrontal cortex compared with controls. Hypothesis 1b: Older persons with HF will exhibit a greater decline in grey matter volume in the temporal lobe and prefrontal cortex over 12-months compared with controls.