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Using arterial spin labeling perfusion MRI to explore how midazolam produces anterograde amnesia
Peipeng Liang1, Anna Manelis, Xiaonan Liu
1Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing 100053, China.
Abstract:
While our previous work suggests that the midazolam-induced memory impairment results from the inhibition of new association formation, little is known about the neural correlates underlying these effects beyond the effects of GABA agonists on the brain. We used arterial spin-labeling perfusion MRI to measure cerebral blood flow changes associated with the effects of midazolam on ability to learn arbitrary word-pairs. Using a double-blind, within-subject cross-over design, subjects studied word-pairs for a later cued-recall test while they were scanned. Lists of different word-pairs were studied both before and after an injection of either saline or midazolam. As expected, recall was severely impaired under midazolam. The contrast of MRI signal before and after midazolam administration revealed a decrease in CBF in the left dorsolateral prefrontal cortex (DLPFC), left cingulate gyrus and left posterior cingulate gyrus/precuneus. These effects were observed even after controlling for any effect of injection. A strong correlation between the midazolam-induced changes in neural activity and memory performance was found in the left DLPFC. These findings provide converging evidence that this region plays a critical role in the formation of new associations and that low functioning of this region is associated with anterograde amnesia.
Insights
Midazolam impairs memory by reducing blood flow in key brain regions like the left dorsolateral prefrontal cortex (DLPFC). This reduced activity in the DLPFC is linked to difficulties in forming new associations and anterograde amnesia.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Radiology
Background:
- Midazolam, a benzodiazepine, is known to cause memory impairment.
- Previous research suggests GABAergic mechanisms are involved, but neural correlates are not fully understood.
- Understanding the neural basis of midazolam-induced amnesia is crucial for cognitive function research.
Purpose of the Study:
- To investigate the neural correlates of midazolam-induced memory impairment using perfusion MRI.
- To examine the effects of midazolam on the ability to learn arbitrary word-pairs.
- To identify specific brain regions affected by midazolam during memory formation.
Main Methods:
- Arterial spin-labeling perfusion MRI was used to measure cerebral blood flow (CBF).
- A double-blind, within-subject, cross-over design was employed.
- Subjects studied word-pairs and underwent cued-recall tests before and after saline or midazolam administration.
Main Results:
- Midazolam significantly impaired word-pair recall.
- A decrease in CBF was observed in the left dorsolateral prefrontal cortex (DLPFC), left cingulate gyrus, and left posterior cingulate gyrus/precuneus after midazolam administration.
- A strong correlation was found between reduced left DLPFC activity and memory performance deficits.
Conclusions:
- The left DLPFC plays a critical role in the formation of new associations.
- Reduced functioning in the left DLPFC is associated with midazolam-induced anterograde amnesia.
- Arterial spin-labeling perfusion MRI is a valuable tool for studying the neural basis of drug-induced cognitive impairments.
