[Effect of fentanyl, diazepam and flunitrazepam on memory function. A pharmacopsychologic study]

Area of Science:

• Pharmacology
• Neuroscience
• Cognitive Psychology

Background:

• Benzodiazepines are commonly prescribed for anxiety and insomnia.
• Amnesic effects of sedatives can impact memory storage, retention, or retrieval.
• Understanding drug-induced memory impairment is crucial for patient safety.

Purpose of the Study:

• To differentiate amnesic effects of diazepam, flunitrazepam, and fentanyl on memory processes.
• To correlate memory impairment with vigilance task alterations.
• To investigate whether drugs affect storage, retention, or retrieval of information.

Main Methods:

• Double-blind, randomized study with 4 groups (7 volunteers each).
• Quasi-continuous word recognition task to assess memory.
• Measurements of reaction time, concentration, and short-term memory.
• Infusion of diazepam, flunitrazepam, fentanyl, or placebo.

Main Results:

• Both benzodiazepines (diazepam, flunitrazepam) specifically impaired memory function.
• Flunitrazepam exhibited more pronounced and longer-lasting memory impairment.
• Retrieval of pre-drug learned information was unaffected, indicating encoding/registration impairment.
• Diazepam did not significantly alter reaction times; flunitrazepam prolonged them by over 50%.

Conclusions:

• Diazepam and flunitrazepam specifically impair the encoding and registration of new information.
• Flunitrazepam has a more significant sedative effect and amnesic impact than diazepam.
• Memory retrieval processes remain intact following administration of these benzodiazepines.