Why the study?
Poor self-management and compliance do not fully explain why heart failure patients with cognitive impairment have a high risk of cardiac events, prompting investigation into central nervous system mechanisms.
Does cognitive impairment increase the risk of major arrhythmic events in patients with HFrEF?
Does cognitive impairment increase the risk of major arrhythmic events in patients with HFrEF?
Cognitive impairment in HFrEF patients is associated with a significantly increased risk of major arrhythmic events, potentially mediated by central autonomic network dysfunction and prolonged QTc intervals.
Associated with increased major arrhythmic risk in HFrEF; leaves open whether cognitive screening aids risk stratification.
BACKGROUND: Epidemiological studies have indicated that patients with heart failure (HF) who experience cognitive impairment (CI) have a poor prognosis. While poor self-management and compliance are suggested as contributing factors, they do not fully explain the underlying mechanisms of high risk of cardiac events in HF patients with CI. Given the interconnectedness of CI and the autonomic nervous system (ANS), both regulated by the central nervous system, this study investigated the relationship among cognitive function, metabolism in ANS-related brain regions, and major arrhythmic events (MAEs) in patients with HF with reduced ejection fraction (HFrEF). RESULTS: F-FDG positron emission tomography/computed tomography imaging, and cognitive testing. Cognitive function was evaluated using the Mini-Mental State Examination. During the follow-up period, 13 patients (17.8%) experienced MAEs. Patients with MAEs exhibited decreased cognitive function across various domains, including orientation, registration, and language and praxis (all p < 0.05). Patients with CI displayed a prolonged heart rate-corrected QT (QTc) interval and hypometabolism in the left hippocampus and bilateral caudate nuclei (all p < 0.05). Significant correlations were observed between cognitive function, QTc interval, and metabolism in ANS-related brain regions (all p < 0.05). Cox regression model analysis showed that the predictive value of cognitive function is not independent of the QTc interval and there is a significant interaction. The mediation analyses suggested that a prolonged QTc interval resulting from ANS disorder increased risk of MAEs in HFrEF patients with CI. Patients with CI exhibited reduced central autonomic network (CAN) connectivity. CONCLUSION: ANS dysfunction, exacerbated by reduced metabolism in ANS-related brain regions and CAN connectivity, contributed to an increased risk of MAEs in HFrEF patients with CI.
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Shi et al. (2024) studied this question.
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