Effect of Repeated Exposure to Sevoflurane on Electroencephalographic Alpha Oscillation in Pediatric Patients
Samuel Madariaga1,2, Christ Devia1,2, Antonello Penna3,4
1Centro Nacional de Inteligencia Artificial (CENIA) Chile.
Insights
Children undergoing repeated sevoflurane anesthesia for radiotherapy did not develop tolerance. However, some patients showed reduced alpha relative power with increased anesthetic exposure, warranting further investigation into sevoflurane effects.
Area of Science:
- Anesthesiology
- Pediatric Anesthesia
- Neuroscience
Background:
- Pharmacological tolerance is a reduced drug effect over time or increased dosage requirement.
- The development of sevoflurane tolerance in children with repeated exposure is not well-established.
- Sevoflurane is commonly used for anesthesia in pediatric patients undergoing procedures like radiotherapy.
Purpose of the Study:
- To investigate whether repeated sevoflurane anesthesia exposure induces pharmacological tolerance in children younger than 6 years.
- To analyze electroencephalographic (EEG) spectral power changes across multiple anesthesia sessions to assess tolerance development.
- To identify potential correlations between the number of radiotherapy sessions and EEG parameters indicative of tolerance.
Main Methods:
- An observational study involving 18 children under 6 years old undergoing multiple radiotherapy sessions with sevoflurane anesthesia.
- Analysis of electroencephalographic spectral power (including alpha relative power and spectral edge frequency 95) at anesthetic induction across sessions.
- Application of linear regression and linear mixed-effect models to evaluate the association between radiotherapy sessions and EEG outcomes.
Main Results:
- No overall correlation was found between the number of radiotherapy sessions and induction time.
- A subgroup of patients showed an inverse correlation between alpha relative power and spectral edge frequency 95 with the number of anesthesia sessions.
- This subgroup did not exhibit significant differences in age, sex, or total radiotherapy sessions compared to other participants.
Conclusions:
- Repeated sevoflurane anesthesia for radiotherapy in children does not appear to induce pharmacological tolerance.
- A subset of pediatric patients may experience alterations in EEG spectral power (specifically alpha relative power) with cumulative anesthetic exposure.
- Further research is warranted to explore the implications of these findings on sevoflurane's effects in children.
Background:
Pharmacological tolerance is defined as a decrease in the effect of a drug over time, or the need to increase the dose to achieve the same effect. It has not been established whether repeated exposure to sevoflurane induces tolerance in children.
Methods:
We conducted an observational study in children younger than 6 years of age scheduled for multiple radiotherapy sessions with sevoflurane anesthesia. To evaluate the development of sevoflurane tolerance, we analyzed changes in electroencephalographic spectral power at induction, across sessions. We fitted individual and group-level linear regression models to evaluate the correlation between the outcomes and sessions. In addition, a linear mixed-effect model was used to evaluate the association between radiotherapy sessions and outcomes.
Results:
Eighteen children were included and the median number of radiotherapy sessions per child was 28 (interquartile range: 10 to 33). There was no correlation between induction time and radiotherapy sessions. At the group level, the linear mixed-effect model showed, in a subgroup of patients, that alpha relative power and spectral edge frequency 95 were inversely correlated with the number of anesthesia sessions. Nonetheless, this subgroup did not differ from the other subjects in terms of age, sex, or the total number of radiotherapy sessions.
Conclusions:
Our results suggest that children undergoing repeated anesthesia exposure for radiotherapy do not develop tolerance to sevoflurane. However, we found that a group of patients exhibited a reduction in the alpha relative power as a function of anesthetic exposure. These results may have implications that justify further studies.
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