Can you hear words while asleep under anesthesia?
NCT ID NCT00584324
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether the depth of anesthesia during surgery affects a person's ability to hear spoken words without being aware of it, and whether this influences anxiety after surgery. Seventy adults having urologic or orthopedic procedures took part. The goal was to understand how different anesthesia levels might impact unconscious memory, not to test a new treatment.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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70 people
The number who actually took part.
- Start date
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Mar 2006
- Finished
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Jan 2012
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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55 to 90 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Persons signing informed consent * Elective general surgery for orthopedics (external or internal fixation) or urologic (transurethral) * Literate * Native English speaking Exclusion Criteria: * Hearing impaired * History of cognitive dysfunction * Subjects requiring post-operative sedation for any indication
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Oklahoma Health Sciences Center
Oklahoma City, Oklahoma, 73104, United States
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