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The forgotten role of central volume in low frequency oscillations of heart rate variability
Manuela Ferrario1, Ulrich Moissl2, Francesco Garzotto3
1Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Italy.
Insights
Central blood volume significantly influences low-frequency heart rate variability oscillations in hemodialysis patients. Hydration status impacts these heart rate variability changes during dialysis treatment.
Area of Science:
- Cardiovascular Physiology
- Renal Medicine
- Biomedical Engineering
Background:
- Heart rate variability (HRV) analysis is crucial for understanding autonomic nervous system function.
- Low-frequency (LF) oscillations in HRV are influenced by various physiological factors, including central volume.
- End-stage renal disease (ESRD) patients undergoing hemodialysis (HD) experience significant fluid shifts and autonomic activation.
Purpose of the Study:
- To investigate the role of central volume in generating low-frequency (LF) oscillations of heart rate variability (HRV).
- To assess how fluid overload (FO) and hydration status affect LF oscillations during hemodialysis (HD).
Main Methods:
- Studied 58 chronic HD patients, measuring fluid overload (FO) using whole-body bioimpedance before HD.
- Recorded 24-hour Holter electrocardiograms to analyze HRV time and frequency domains.
- Classified patients into three groups based on tertiles of FO normalized to extracellular water (FO/ECW%) and stratified by diabetes mellitus.
Main Results:
- Patients with lower to medium pre-dialysis hydration status (1st and 2nd FO/ECW% tertiles) showed a significant increase in LF power during the final 30 minutes of HD.
- No significant change in LF power was observed in the group with high pre-treatment hydration (3rd FO/ECW% tertile).
- These findings suggest hydration status modulates LF oscillations during fluid shifts induced by HD.
Conclusions:
- Central volume is a key determinant of LF oscillation power in HRV.
- Fluid overload and hydration status significantly impact the cardiovascular response to hemodialysis.
- Understanding central volume's role is essential for interpreting HRV in fluid-overloaded patients.
Abstract:
The hypothesis that central volume plays a key role in the source of low frequency (LF) oscillations of heart rate variability (HRV) was tested in a population of end stage renal disease patients undergoing conventional hemodialysis (HD) treatment, and thus subject to large fluid shifts and sympathetic activation. Fluid overload (FO) in 58 chronic HD patients was assessed by whole body bioimpedance measurements before the midweek HD session. Heart Rate Variability (HRV) was measured using 24-hour Holter electrocardiogram recordings starting before the same HD treatment. Time domain and frequency domain analyses were performed on HRV signals. Patients were retrospectively classified in three groups according to tertiles of FO normalized to the extracellular water (FO/ECW%). These groups were also compared after stratification by diabetes mellitus. Patients with the low to medium hydration status before the treatment (i.e. 1st and 2nd FO/ECW% tertiles) showed a significant increase in LF power during last 30 min of HD compared to dialysis begin, while no significant change in LF power was seen in the third group (i.e. those with high pre-treatment hydration values). In conclusion, several mechanisms can generate LF oscillations in the cardiovascular system, including baroreflex feedback loops and central oscillators. However, the current results emphasize the role played by the central volume in determining the power of LF oscillations.
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