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Auditory evoked potentials during propofol anaesthesia in man
D Chassard1, A Joubaud, A Colson
1Département d'Anesthésie-Réanimation, Centre Hospitalier Lyon-Sud, France.
British Journal of Anaesthesia
|May 1, 1989
Summary
Propofol anesthesia significantly impacts auditory evoked potentials during otorhinolaryngology surgery. Brainstem wave latencies increased, while middle latency components were markedly affected.
Area of Science:
- Anesthesiology
- Neurophysiology
- Otorhinolaryngology
Background:
- Auditory evoked potentials (AEPs) are crucial for assessing auditory pathway function.
- Propofol is a widely used anesthetic agent, but its precise effects on AEPs require further elucidation, especially in surgical contexts.
Purpose of the Study:
- To investigate the effects of propofol anesthesia on auditory evoked potentials.
- To analyze changes in both middle and brainstem components of AEPs during otorhinolaryngology surgery.
Main Methods:
- Nine patients undergoing otorhinolaryngology surgery were studied.
- Basal AEPs were recorded, followed by propofol induction (2 mg/kg) and maintenance infusions (7, 5, and 3 mg/kg/h).
- AEPs were recorded at 10-minute intervals (T1, T2, T3) throughout anesthesia.
Main Results:
- Propofol significantly increased the latencies of brainstem waves I, III, and V.
- The amplitudes of brainstem waves I, III, and V remained constant.
- The middle latency component of AEPs was markedly affected by propofol.
Conclusions:
- Propofol anesthesia alters auditory pathway function, evidenced by changes in AEPs.
- The observed effects suggest propofol's impact on both peripheral and central auditory processing.
- These findings are relevant for monitoring anesthetic depth and auditory pathway integrity during surgery.