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Ketamine: behavioral effects of subanesthetic doses
Journal of Clinical Psychopharmacology
|April 1, 1985
Summary
Subanesthetic ketamine doses impair memory recall in healthy adults, primarily due to retrieval interference. Adverse reactions were frequent, necessitating benzodiazepine co-administration.
Area of Science:
- Pharmacology
- Neuroscience
- Cognitive Psychology
Background:
- Ketamine is an anesthetic agent with known psychoactive effects.
- Subanesthetic doses are explored for potential therapeutic applications, but cognitive effects require clarification.
Purpose of the Study:
- To evaluate the impact of low-dose ketamine on memory, cognition, and psychomotor function.
- To assess subjective mood changes and the occurrence of adverse reactions.
Main Methods:
- 34 healthy young volunteers received subanesthetic ketamine doses (0.25 and 0.5 mg/kg).
- Cognitive functions, including immediate and delayed recall, were assessed.
- Psychomotor performance, mood, and adverse events were monitored.
Main Results:
- Ketamine significantly impaired both immediate and delayed memory recall.
- Memory deficits were mainly attributed to difficulties in information retrieval.
- Cognitive recovery was observed within 60 minutes post-administration.
- A high incidence of adverse reactions was reported, requiring intervention.
Conclusions:
- Subanesthetic ketamine doses negatively affect memory retrieval in healthy adults.
- Adverse reactions are common, suggesting the need for concurrent medication like benzodiazepines.
- Careful monitoring is essential when administering even low doses of ketamine.