Related Experiment Videos
Implicit memory formation in sedated ICU patients after cardiac surgery
1Department of Anaesthetics and Intensive Care, University of Auckland, Waikato Clinical School, Hamilton, New Zealand.
British Journal of Anaesthesia
|November 25, 2003
Summary
This study found no evidence of memory formation in intensive care unit patients receiving moderate to deep propofol sedation after cardiac surgery. Memory testing revealed no significant differences between target and distractor word lists.
Area of Science:
- Anesthesiology
- Neuroscience
- Critical Care Medicine
Background:
- Conflicting research exists on memory formation during sedation.
- Investigated explicit and implicit memory in ICU patients under propofol sedation post-cardiac surgery.
Purpose of the Study:
- To investigate memory formation in ICU patients under moderate to deep propofol sedation.
- To differentiate between explicit and implicit memory recall.
Main Methods:
- Used free-association (F-A) word-pair testing (n=33) for conceptual implicit memory.
- Employed the process dissociation procedure (PDP) (n=26) for perceptual implicit and explicit memory.
- Administered memory tests to sedated patients and again when awake and cooperative.
Main Results:
- The F-A group showed no significant difference between target (7%) and distractor (9%) word lists.
- The PDP group showed no significant differences between inclusion (11%), exclusion (10%), and distractor (13%) lists.
- No statistically significant memory recall was detected in either testing group.
Conclusions:
- No evidence of memory formation was found in post-cardiac surgery patients under propofol sedation.
- Moderate to deep propofol sedation appears to prevent memory encoding in this patient population.