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Updated: Jun 21, 2026

Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
Published on: September 11, 2018
Autonomic nervous system and cardiovascular disease
Alain Deschamps1, André Denault
1Department of Anesthesiology, Montreal Heart Institute, Montreal, Quebec, Canada. deschamps.a@gmail.com
Anesthesiologists can now monitor autonomic tone noninvasively using heart rate and blood pressure variability. This offers earlier warnings of complications in at-risk patients compared to traditional vital signs.
Area of Science:
- Anesthesiology and Perioperative Medicine
- Autonomic Neuroscience
- Cardiovascular Physiology
Background:
- Anesthesia impacts autonomic nervous system function, necessitating vital sign monitoring for homeostasis.
- Patients with autonomic dysfunction or genetic predispositions face heightened risks during anesthesia.
- Conventional vital signs may not provide adequate early warnings for these vulnerable patients.
Purpose of the Study:
- To introduce novel noninvasive methods for monitoring perioperative autonomic tone.
- To explain the principles behind heart rate and blood pressure variability analysis.
- To discuss the clinical utility of these methods for anesthesiologists.
Main Methods:
- Utilizing noninvasive techniques to measure sympathetic and parasympathetic nervous system output.
- Analyzing heart rate variability (HRV) and blood pressure variability (BPV) patterns.
- Applying signal processing and statistical methods to interpret variability data.
Main Results:
- Heart rate and blood pressure variability analysis provides insights into autonomic tone.
- These methods can detect changes in autonomic function before alterations in standard vital signs.
- Potential for early detection of adverse events in high-risk surgical patients.
Conclusions:
- Noninvasive autonomic tone monitoring using HRV and BPV analysis is a promising advancement.
- These techniques can enhance patient safety by providing earlier warnings of complications.
- Further research and integration into clinical practice could significantly benefit anesthesiology.
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