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[Acoustic evoked potentials mid-latency following anesthesia with sufentanil]
D Schwender1, E Weninger, N Schnatmann
1Institut für Anästhesiologie, Ludwig-Maximilians-Universität München.
Der Anaesthesist
|July 1, 1995
Summary
General anesthesia with sufentanil preserves primary cortical processing of auditory stimuli, as indicated by stable mid-latency auditory evoked potentials (MLAEP) in the auditory cortex during surgery. Brainstem responses remained stable, while later cortical components showed minimal changes.
Area of Science:
- Neuroscience
- Anesthesiology
- Auditory Neuroscience
Background:
- General anesthesia impacts brain function, particularly sensory processing.
- Opioids are commonly used for anesthesia, but their precise effects on auditory processing require further investigation.
Purpose of the Study:
- To investigate the effects of sufentanil-induced general anesthesia on mid-latency auditory evoked potentials (MLAEP).
- To assess the preservation of auditory cortical processing during anesthesia.
Main Methods:
- Studied MLAEP in ten patients undergoing major urological surgery under sufentanil anesthesia.
- Recorded MLAEP before and during anesthesia, measuring latencies and amplitudes of specific peaks (V, Na, Pa, Nb, Pl).
Main Results:
- The brainstem response (V) remained stable during anesthesia.
- Later cortical potentials (Na, Pa) showed only minor increases in latency and decreases in amplitude, similar to awake states.
- Late potentials (Nb, Pl) exhibited increased latency and decreased amplitude.
Conclusions:
- Sufentanil's effect on MLAEP is comparable to other opioids like alfentanil, fentanyl, and morphine.
- Primary cortical processing of auditory stimuli appears to be preserved during sufentanil anesthesia.
- The findings suggest that the auditory cortex maintains function during general anesthesia with sufentanil.