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Determinants of cardiac autonomic dysfunction in ESRD
Christopher T Chan1, Nathan W Levin, Glenn M Chertow
1Department of Medicine, University Health Network, Toronto, Ontario, Canada. christopher.chan@uhn.on.ca
Summary
Patients with end-stage renal disease on hemodialysis exhibit sympathetic overactivity and vagal withdrawal. This autonomic dysfunction is linked to increased left ventricular mass and reduced physical performance, suggesting targets for cardiovascular event prevention.
Area of Science:
- Cardiology
- Nephrology
- Autonomic Neuroscience
Background:
- Cardiovascular events are a leading cause of mortality in patients with end-stage renal disease (ESRD).
- The roles of sympathetic overactivity and vagal withdrawal in cardiovascular events in ESRD patients undergoing hemodialysis remain unclear.
- Heart rate variability (HRV) offers insights into autonomic nervous system modulation.
Purpose of the Study:
- To determine the prevalence of autonomic dysfunction, specifically sympathetic overactivity and vagal withdrawal, in patients on hemodialysis.
- To identify clinical correlates of HRV in this patient population.
- To explore the relationship between HRV, left ventricular mass (LVM), and physical performance.
Main Methods:
- A cohort of 239 patients undergoing hemodialysis were enrolled in the Frequent Hemodialysis Network Daily Trial.
- Baseline data included demographics, clinical conditions, laboratory values, medications, physical performance, and left ventricular mass (LVM).
- 24-hour Holter monitoring was performed to assess heart rate variability parameters, including R-R intervals and spectral power analyses for sympathetic (low-frequency) and vagal (high-frequency) modulation.
Main Results:
- Patients on hemodialysis demonstrated reduced HRV, characterized by low-frequency power (sympathetic modulation) and high-frequency power (vagal modulation).
- Left ventricular mass (LVM) was inversely correlated with high-frequency power and mean R-R intervals, remaining significant after multivariable adjustment.
- Impaired physical performance was associated with lower mean and standard deviation of R-R intervals.
Conclusions:
- Hemodialysis patients exhibit significant sympathetic overactivity and vagal withdrawal, as evidenced by HRV analysis.
- Autonomic dysfunction in this population is associated with increased left ventricular mass and diminished physical capacity.
- Understanding HRV patterns and their determinants is crucial for developing preventive and therapeutic strategies against cardiovascular events in ESRD.
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