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Differences among heart rate variability measures after anesthesia and cardiac surgery
R J Storella1, J C Horrow, M Polansky
1Department of Anesthesiology, MCP-Hahnemann School of Medicine, Allegheny University of the Health Sciences, Philadelphia, PA, USA. storella@bellatlantic.net
Journal of Cardiothoracic and Vascular Anesthesia
|September 1, 1999
Summary
Heart rate variability (HRV) measures, including nonlinear ones, showed significant decreases after anesthesia and cardiac surgery. Postoperative recovery varied among measures, suggesting distinct cardiovascular system responses.
Area of Science:
- Cardiology
- Anesthesiology
- Biomedical Engineering
Background:
- Heart rate variability (HRV) is a key indicator of cardiovascular system health.
- Anesthesia and cardiac surgery significantly impact physiological parameters, including autonomic nervous system function.
- Understanding HRV changes post-surgery is crucial for patient monitoring and recovery assessment.
Purpose of the Study:
- To investigate differences in traditional and nonlinear heart rate variability (HRV) measures following anesthesia and cardiac surgery.
- To assess the recovery patterns of various HRV metrics in the postoperative period.
Main Methods:
- Prospective study conducted at a university hospital.
- HRV was measured in 13 patients undergoing cardiac surgery using electrocardiograms (ECGs).
- Measurements included standard deviation (SD), approximate entropy (ApEn), and point correlation dimension (PD2) from 400 heartbeat intervals before anesthesia, during anesthesia, and on the first postoperative day.
Main Results:
- All HRV measures (SD, ApEn, PD2) significantly decreased during anesthesia.
- Approximate entropy (ApEn) recovered to baseline levels postoperatively.
- Standard deviation (SD) and point correlation dimension (PD2) did not fully recover and remained significantly lower than baseline values.
- Correlations among the different HRV measures were weak.
Conclusions:
- Nonlinear HRV measures exhibit distinct behaviors after anesthesia and cardiac surgery.
- The combination of traditional and multiple nonlinear HRV measures may enhance cardiovascular system assessment.
- These findings highlight the complex impact of surgical procedures and anesthesia on autonomic regulation.