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Brainstem auditory evoked potentials during procaine toxicity in dogs.
Summary
Procaine toxicity suppresses brainstem auditory pathways, even when the cerebral cortex shows seizure activity. This study observed changes in brainstem auditory evoked potentials (BAEPs) and electroencephalogram (EEG) in dogs.
Area of Science:
- Neuroscience
- Pharmacology
- Auditory Neuroscience
Background:
- Local anesthetics' effects on the cerebral cortex are well-documented.
- Limited research exists on local anesthetic toxicity in the brainstem.
Purpose of the Study:
- To investigate the toxic effects of procaine on the brainstem auditory pathway.
- To analyze changes in brainstem auditory evoked potentials (BAEPs) and electroencephalogram (EEG) during procaine toxicity.
Main Methods:
- Procaine was administered intravenously to 15 dogs at a dose of 15 mg/kg.
- Brainstem auditory evoked potentials (BAEPs) and electroencephalogram (EEG) were recorded.
- Changes in wave amplitudes, inter-peak latencies, and EEG patterns were analyzed.
Main Results:
- Procaine administration increased amplitudes of BAEP waves I and II.
- Procaine decreased amplitudes of BAEP waves III, IV, and V.
- Inter-peak latencies (I-III and III-V) were significantly prolonged.
- EEG patterns shifted from awake to seizure activity.
Conclusions:
- Procaine toxicity suppresses the electrical activity of the brainstem auditory pathway.
- Brainstem auditory function can be impaired even when the cerebral cortex exhibits excitatory seizure activity.
- These findings highlight the differential susceptibility of brain regions to local anesthetic toxicity.