Neurocognitive Benefit of Weight-Loss Interventions in Older Patients with Heart Failure with Preserved Ejection Fraction

ObjectivesEvaluate neurocognitive health and its response to interventions in older, obese patients with heart failure with preserved ejection fraction (HFpEF). BackgroundNeurocognitive dysfunction may be an underrecognized feature of HFpEF that responds to weight-loss interventions. MethodsWe first compared detailed baseline cognitive testing (Uniform Data Set version 3 and Rey Auditory Verbal Learning Test [RAVLT]), and brain volumes and cerebral blood flow (CBF) from 3T magnetic resonance imaging between older patients with HFpEF (n=46) and healthy age-matched controls (HC; n=22). The HFpEF patients were then randomized to a 20-week caloric restriction (CR) intervention with either aerobic-only (CR+AT; n=23) or aerobic+resistance exercise training (CR+AT+RT; n=23), and repeated cognitive testing and neuroimaging post-intervention. Cognitive scores were normalized to national data and transformed to z-scores for global, memory, attention, executive function, visuospatial, and language fluency domains. ResultsCompared to HC, participants with HFpEF had significantly lower baseline global cognitive performance, and lower global, visuospatial processing and language fluency domain z-scores than normative means. Following the diet and exercise intervention, there were significant improvements in global (+0.6 [95% CI: 0.3, 0.8]) and category fluency (+0.2 [95% CI: -0.004, 0.3]) z-scores, and in RAVLT immediate (+0.6 [95% CI: 0.1, 1.0] points) and delayed (0.9 [95% CI: 0.2, 1.6] points) recall. Only CR+AT+RT was associated with improved phonemic fluency z-score (+0.4 [95% CI: 0.1, 0.7]). There were no significant intervention effects on brain volumes or CBF. ConclusionsOlder, obese patients with chronic HFpEF have significant cognitive deficits that are ameliorated by diet and exercise interventions.