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Ambient Music Decreases EEG Burst-Suppression Ratio During General Anesthesia in Rats
Vlad-Petru Morozan1,2, Mihai Stancu1,3, Alexandru-Cătălin Pâslaru1,4
1Division of Physiology-Neuroscience, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania.
Sensors (Basel, Switzerland)
|June 12, 2026
Summary
Ambient music can affect the suppression ratio (SR), a measure of anesthetic depth. This study in rats shows that sound influences EEG monitoring, impacting anesthesia depth assessment.
Area of Science:
- Anesthesiology
- Neuroscience
- Biomedical Engineering
Background:
- Deep anesthesia often targets burst-suppression patterns in EEG.
- The suppression ratio (SR) quantifies burst-suppression, commonly used for monitoring anesthetic depth.
- Emerging evidence indicates SR may be influenced by external stimuli.
Purpose of the Study:
- To investigate if ambient music alters the suppression ratio (SR) in rats under different anesthetics.
- To assess auditory-induced burst-suppression reactivity.
- To determine if ambient sound affects EEG-based anesthesia monitoring.
Main Methods:
- Male Wistar rats were anesthetized with sevoflurane, chloral hydrate, or isoflurane.
- A 60-second audio clip was played to assess auditory stimulation.
- Suppression ratio (SR) and burst-suppression reactivity index (BSRi) were measured.
Main Results:
- Auditory stimulation transiently decreased SR across all tested anesthetics.
- This decrease correlated with increased burst occurrence rate, not duration.
- Burst-suppression reactivity index (BSRi) varied depending on the anesthetic agent.
Conclusions:
- The suppression ratio (SR) reflects both anesthetic depth and ambient stimulation levels.
- Ambient noise in clinical settings may influence EEG-based anesthesia monitoring.
- Findings suggest a need to consider environmental factors in interpreting EEG data during anesthesia.
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