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Brain Dynamics in Different Stages of Arousal and Anesthesia (ECOG)

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: NCT01574443
Recruitment Status : Terminated (Feasibility issues for subject recruitment and PI left the institution)
First Posted : April 10, 2012
Last Update Posted : November 6, 2017
Information provided by (Responsible Party):
Weill Medical College of Cornell University

Brief Summary:
The principle aim of this project is to characterize the changes in relative stability of the intrinsic brain dynamics during onset of sleep and induction of general anesthesia. The investigators hypothesize that brain dynamics in the awake state are critical akin to physical systems close to a second order phase transition and that during loss of consciousness the dynamics move away from the critical point.

Condition or disease

Detailed Description:
  1. Once the electrode array is placed during the first surgery (on the day of admission) we will record brain activity as subjects are waking up from anesthesia
  2. While subjects are staying at New York Presbyterian hospital before the second surgery we will record brain activity. Most of the recordings will be performed as subjects are going to sleep naturally, but other recordings will be acquired during waking hours. This will not interfere with normal monitoring of seizure activity.
  3. Final recording session is immediately before the second operation as general anesthesia is gradually induced. During this time subjects may be asked to follow simple commands like: "Open your eyes" in order to determine the level of consciousness. Also during this session, if arterial line is placed by the anesthesiologist for real-time blood pressure monitoring we will collect several small (~1 ml) blood samples to determine blood concentration of anesthetics. Approximately 1 teaspoon of blood will be obtained in total. No additional venipuncture will be necessary.

No additional invasive procedures will be performed for the purposes of the study. We will use the same electrode array as is typically used for monitoring and mapping of epilepsy. Subjects will receive the same anesthetic agent as is commonly used for induction of anesthesia for this surgery (propofol). Subjects will be monitored in the same way as is normally done during surgical procedures and during your stay at New York Presbyterian hospital.

As a part of the study subjects may be asked simple questions as they go under anesthesia.

We may collect several small blood samples (described above) to determine the concentration of anesthetic agents.

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Study Type : Observational
Actual Enrollment : 5 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Brain Dynamics in Different Stages of Arousal and Anesthesia
Actual Study Start Date : August 22, 2011
Actual Primary Completion Date : May 11, 2015
Actual Study Completion Date : April 8, 2016

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Epilepsy

epilepsy resection patients
Patients undergoing resection for refractory epilepsy

Primary Outcome Measures :
  1. Characterization of changes in brain dynamics during induction of anesthesia, using electrocorticography (ECoG). [ Time Frame: < 1 hour ]
    The patterns of electrical activity during induction and emergence from anesthesia will be compared to what is recorded during natural sleep.

Information from the National Library of Medicine

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Ages Eligible for Study:   15 Years to 65 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients undergoing epilepsy resection surgery

Inclusion Criteria:

1.Patients referred for epilepsy resection surgery with Dr. Theodore Schwartz

Exclusion Criteria:

  1. Patient refusal.
  2. Patients requiring rapid sequence induction because of concerns about delayed gastric emptying as a result of diabetes or other medical conditions.
  3. Age less than 15 or greater than 65 years old.
  4. Pregnant or nursing.
  5. Inability to follow simple commands such as "Open your eyes" and "Squeeze my hand" for any reason.
  6. Severe mental disability.
  7. Allergy to propofol or any components of the formulation.
  8. Poor suitability for propofol infusion because of other medical concerns such as severe heart disease.
  9. Patients deemed to have a difficult airway thus necessitating awake fiberoptic intubation.
  10. Patients with severe sleep apnea requiring CPAP/BiPAP.

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): NCT01574443

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United States, New York
New York Presbyterian Hospital/ Weill Cornell Medical College
New York, New York, United States, 10065
Sponsors and Collaborators
Weill Medical College of Cornell University
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Principal Investigator: Kane Pryor, MD Weill Medical College of Cornell University
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Responsible Party: Weill Medical College of Cornell University Identifier: NCT01574443    
Other Study ID Numbers: 1106011763
First Posted: April 10, 2012    Key Record Dates
Last Update Posted: November 6, 2017
Last Verified: November 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Weill Medical College of Cornell University:
Additional relevant MeSH terms:
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Brain Diseases
Central Nervous System Diseases
Nervous System Diseases