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Changes in hippocampal monoamine concentration following halothane anesthesia and concussion
G Eschun1, D Parkinson, J Vriend
1Faculty of Medicine, University of Manitoba, Winnipeg, Canada.
Surgical Neurology
|February 1, 1992
Summary
Anesthesia increases norepinephrine in rat hippocampus, a level that returns to normal after 50 minutes or is abolished by concussion. This timeframe correlates with memory recovery post-concussion.
Area of Science:
- Neuroscience
- Neurochemistry
- Anesthesiology
Background:
- Anesthesia can induce physiological stress responses.
- Norepinephrine is a key neurotransmitter involved in stress and memory.
Purpose of the Study:
- To investigate the effect of halothane anesthesia on hippocampal norepinephrine levels in rats.
- To determine the impact of concussion on these neurochemical changes.
Main Methods:
- Measurement of norepinephrine and its metabolites in rat hippocampus.
- Administration of halothane anesthesia.
- Induction of concussion in anesthetized rats.
Main Results:
- Halothane anesthesia significantly increased hippocampal norepinephrine levels.
- This increase persisted for approximately 50 minutes.
- Concussion abolished the elevated norepinephrine levels.
- No significant changes were observed in DOPAC, L-DOPA, or DHBA.
- 5-Hydroxy indole acetic acid (HIAA) showed non-significant transient decreases.
Conclusions:
- Anesthesia-induced stress elevates hippocampal norepinephrine.
- Norepinephrine levels normalize around the time of memory recovery after concussion.
- Norepinephrine may play a role in the transient memory deficits associated with concussion.