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Postoperative Delirium: EEG Markers of Sleep and Wakefulness

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03291626
Recruitment Status : Active, not recruiting
First Posted : September 25, 2017
Last Update Posted : January 31, 2023
Information provided by (Responsible Party):
Ben J.A. Palanca, Washington University School of Medicine

Brief Summary:

Postoperative delirium is a condition in which patients develop temporary difficulties in maintaining attention and thinking clearly. These new problems can appear after surgery and change throughout the day. This confusion can last several days.

The overall purpose of this study is to measure brain activity during sleep and wakefulness to learn about their relationships to delirium after surgery. While participants may not feel like their normal self during the study, they are in the best position to help us learn how to improve the recovery of brain function and sleep in others having surgery. The investigators need to learn from those who have and have not become confused after their surgical procedure.

Condition or disease
Postoperative Delirium

Detailed Description:

Postoperative delirium is a condition that can develop in some older patients after they have surgery and receive general anesthesia. Patients that develop delirium have difficulty maintaining attention and thinking clearly. Both of these issues can come and go throughout the day. The incidence of postoperative delirium is greater than 25% and is associated with longer hospitalization and increased risk of persistent mental and physical decline. It is thought that this disorder may be preventable, but there is no agreed upon way of identifying which patients are at risk for delirium prior to their surgery. Additionally, patients with atypical delirium are often misdiagnosed or undiagnosed postoperatively.

Based on previous research, the researchers have hypothesized that delirium may be directly related to wakefulness and sleep problems, as shown on electroencephalography [EEG]. EEG is a test that records the electrical activity of brain through placement of small wires on a person's scalp. In light of this, the purpose of this study is to evaluate sleep and wakefulness using EEG before, during and after surgery in order to discover any abnormalities of sleep or wakefulness that associate with postoperative delirium onset, severity, and length of recovery. Subjects in this study will have preoperative at home sleep testing performed, using a device called the Sleep Profiler, and questionnaires administered to characterize their mental function and brain function prior to surgery. When they arrive for their scheduled surgery, the subjects will be fitted with the Sleep Profiler to record brain activity during surgery and after surgery for 5 days. Postoperatively, the subjects will be asked to do simple tasks like move toes and fingers and to answer questions that assess their mental state.

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Study Type : Observational
Estimated Enrollment : 220 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Postoperative Delirium: EEG Markers of Sleep and Wakefulness
Actual Study Start Date : October 16, 2018
Estimated Primary Completion Date : June 2023
Estimated Study Completion Date : October 2023

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Delirium

Primary Outcome Measures :
  1. Change from pre-operative awake EEG measurement to sleep EEG measurement [ Time Frame: Record at baseline visit or, if the subject is an inpatient, once during the day compared to record obtained overnight either at home or in the hospital ]
    Awake EEG recorded at baseline, sleep EEG using Sleep Profiler

  2. Change in baseline diagnosis of delirium to hospital discharge [ Time Frame: Diagnosis at baseline, then diagnosis change evaluated 2 times daily post-operatively until hospital discharge or post-operative day 5, whichever occurs first. ]
    Delirium diagnosed using the validated instrument Confusion Assessment Method, Long Form

Information from the National Library of Medicine

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Ages Eligible for Study:   60 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Potential participants recruited from the Barnes Jewish Hospital in St. Louis receiving elective cardiac or major thoracic surgery

Inclusion Criteria:

  1. English speaking
  2. Age 60 or older
  3. Scheduled for cardiac surgery requiring cardiopulmonary bypass for coronary artery bypass grafting and/or heart valve repair/replacement

Exclusion Criteria:

  1. Pre-existing delirium or dementia
  2. Legal blindness or severe deafness
  3. Surgery requiring deep hypothermic circulatory rest

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03291626

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United States, Missouri
Barnes-Jewish Hospital/Washington University in St. Louis School of Medicine
Saint Louis, Missouri, United States, 63110
Sponsors and Collaborators
Washington University School of Medicine
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Principal Investigator: Ben Palanca, MD, PhD Washington University in St Louis SOM
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Ben J.A. Palanca, Assoc Prof of Anesthesiology, Washington University School of Medicine Identifier: NCT03291626    
Other Study ID Numbers: 201705018
First Posted: September 25, 2017    Key Record Dates
Last Update Posted: January 31, 2023
Last Verified: January 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: The data will be shared with the National Sleep Research Resource within three years after completion of the study. We will register our observational study on and publish a protocol of our approach and pre-specified analyses by the end of Year 2 of funding.
Supporting Materials: Study Protocol
Time Frame: Data will be made available within 3 years of study completion and publication and will be available indefinitely.
Access Criteria: Permission from the principal investigator is required for access.

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Emergence Delirium
Neurobehavioral Manifestations
Neurologic Manifestations
Nervous System Diseases
Neurocognitive Disorders
Mental Disorders
Postoperative Complications
Pathologic Processes