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Is there implicit memory after propofol sedation?

R C Cork1, J F Heaton, C E Campbell

  • 1Department of Anesthesiology, Louisiana State University Medical Center, New Orleans 70112, USA.

British Journal of Anaesthesia
|April 1, 1996
PubMed
Summary
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Implicit memory, a form of unconscious recall, persists during propofol sedation for surgery. Even without explicit memory, patients demonstrated priming, indicating preserved implicit memory functions.

Area of Science:

  • Anesthesiology
  • Cognitive Neuroscience
  • Psychology

Background:

  • General anesthesia may preserve implicit memory.
  • Propofol is commonly used for sedation during surgical procedures.

Purpose of the Study:

  • To investigate the presence of explicit and implicit memory in patients receiving local or regional anesthesia with propofol sedation.
  • To determine if implicit memory functions persist in the absence of explicit memory.

Main Methods:

  • Patients undergoing surgery received propofol and fentanyl sedation.
  • Memory was tested using word lists for free recall, free association, cued recall, and recognition.
  • Implicit memory was assessed via priming effects in free association tests.

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Main Results:

  • Five out of 36 patients showed explicit memory (free recall).
  • No evidence of explicit memory was found in the remaining 31 patients.
  • Significant priming effects in free association tests indicated preserved implicit memory.

Conclusions:

  • Intraoperative sedation with propofol does not eliminate implicit memory.
  • Implicit memory functions persist even when explicit memory is absent under propofol sedation.