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Linear and nonlinear analysis of heart rate variability during propofol anesthesia for short-duration procedures in
Daniel L Toweill1, W Daniel Kovarik, Richard Carr
1Division of Pediatric Critical Care, Department of Pediatrics, Oregon Health Sciences University, Portland, OR, USA.
Insights
Heart rate variability (HRV) metrics accurately monitor anesthesia depth and pain responses in children receiving propofol. Power spectral analysis of HRV offers a clinically useful tool for assessing neuroautonomic regulation during pediatric procedures.
Area of Science:
- Anesthesiology
- Pediatric Critical Care
- Autonomic Nervous System Regulation
Background:
- Monitoring anesthesia depth and patient response to stimuli is crucial in pediatric procedures.
- Propofol is a common anesthetic agent used for short-duration procedures in children.
- Traditional monitoring methods may not fully capture the nuances of neuroautonomic responses.
Purpose of the Study:
- To evaluate the accuracy of heart rate variability (HRV) metrics for monitoring propofol anesthesia depth in children.
- To assess HRV's ability to detect responses to painful stimuli during anesthesia.
- To determine HRV's utility in evaluating cardiac neuroautonomic regulation in pediatric patients.
Main Methods:
- Prospective case series involving 33 pediatric patients undergoing short procedures under propofol anesthesia.
- Analysis of various HRV metrics including spectral power (low- and high-frequency), detrended fluctuation analysis (alpha), and approximate entropy.
- Comparison of HRV parameters during baseline anesthesia versus periods of painful stimuli.
Main Results:
- Significant increases in heart rate standard deviation, low-frequency power, and the low-/high-frequency ratio were observed during painful stimuli (p <.0001).
- Heart rate alpha also increased significantly during painful procedures (p <.0001), indicating altered autonomic response.
- Mean heart rate and approximate entropy decreased during painful stimuli (p <.001), while high-frequency power showed no significant change (p =.26).
Conclusions:
- Power spectral analysis of heart rate variability is a potentially accurate and clinically valuable method for monitoring propofol anesthesia depth.
- High-frequency HRV power may correlate with anesthesia depth, while low-frequency power reflects sympathetic responses to pain.
- HRV analysis provides insights into the neuroautonomic regulation of cardiac activity during pediatric anesthesia.
Objective:
To determine whether heart rate variability metrics provide an accurate method of monitoring depth of anesthesia, assessing the response to painful stimuli, and assessing neuroautonomic regulation of cardiac activity in children receiving propofol anesthesia for short-duration procedures.
Design:
Prospective, case series.
Setting:
Sixteen-bed pediatric intensive care unit, oncology unit, and endoscopy suite in a tertiary care children's hospital and ophthalmology examination rooms in an associated eye institute.
Patients:
Thirty-three pediatric patients undergoing propofol anesthesia for short procedures.
Interventions:
None.
Measurements And Main Results:
Heart rate variability metrics studied included mean, SD, low- and high-frequency power, detrended fluctuation analysis (represented by correlation coefficient, alpha), and approximate entropy. Compared with the initial anesthetized state, we found increased heart rate SD (3.17 +/- 1.31 vs. 7.05 +/- 0.26 bpm, p <.0001), heart rate low-frequency power (3.69 +/- 0.36 vs. 4.48 +/- 0.41 bpm(2)/Hz, p <.0001), heart rate low-/high-frequency ratio (1.47 +/- 0.26 vs. 1.26 +/- 0.24, p =.001), and heart rate alpha (1.12 +/- 0.24 vs. 1.35 +/- 0.21, p <.0001) during painful procedure. Mean heart rate (105.8 +/- 13.4 vs. 101.5 +/- 12.4 bpm, p =.005) and heart rate approximate entropy decreased with painful procedure (0.75 +/- 0.19 vs. 0.53 + 0.16, p <.001), whereas there was no significant change in heart rate high-frequency power (3.04 +/- 0.63 vs. 3.16 +/- 0.71 bpm(2)/Hz, p =.26).
Conclusions:
We conclude that power spectral analysis of heart rate variability may be an accurate and clinically useful measure of depth of propofol anesthesia. We speculate that high-frequency heart rate power during propofol anesthesia correlates with depth of anesthesia, whereas low-frequency power allows for assessment of the patient's sympathetic response to pain.