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[Effect of propofol on visual evoked potentials during neurosurgery]
Kaoru Hamaguchi1, Itsuo Nakagawa, Shozo Hidaka
1Department of Anesthesia, Chugoku Rosai General Hospital, Kure.
Masui. the Japanese Journal of Anesthesiology
|September 20, 2005
Summary
Propofol anesthesia significantly reduces visual evoked potential (VEP) amplitude during neurosurgery. Monitoring VEP requires caution due to its sensitivity to propofol concentration.
Area of Science:
- Neuroscience
- Anesthesiology
- Clinical Neurophysiology
Context:
- Evoked potentials monitor the central nervous system during neurosurgery.
- Anesthetic depth influences evoked potentials, but visual evoked potential (VEP) research is limited.
- Propofol is a common anesthetic agent used in neurosurgery.
Purpose:
- To investigate the influence of propofol concentration on VEP in neurosurgical patients.
- To quantify changes in VEP amplitude and latency at varying propofol concentrations.
- To correlate VEP changes with bispectral index (BIS) values.
Summary:
- VEP amplitude significantly decreased at higher propofol concentrations (3.0 microg x ml(-1)) compared to lower concentrations (1.5 microg x ml(-1)).
- No significant changes were observed in VEP latency across different propofol concentrations.
- Bispectral index (BIS) values also showed a significant decrease at higher propofol concentrations.
Impact:
- VEP amplitude is highly sensitive to propofol concentration during anesthesia.
- Clinical neurophysiological assessments using VEP require careful consideration of anesthetic levels.
- Findings emphasize the need for caution when interpreting VEP data in patients under propofol anesthesia.