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ADVANCE: Assessment for Defining Variability in Anesthesia Through Novel Clinical EEG (CVI)

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: NCT00689130
Recruitment Status : Completed
First Posted : June 3, 2008
Last Update Posted : March 7, 2012
Information provided by (Responsible Party):
Medtronic - MITG

Brief Summary:

The present study is designed to compare prospectively whether sBIS, sEMG, or CVI variability (brain monitoring) can be used to predict unwanted intraoperative responses (high blood pressure, fast heart rate, tearing, etc.) to stimulation (pain) and to determine whether these intraoperative findings are related to patient-assessed postoperative pain scores.

The hypothesis is that increases in these variability measures are associated with increased probability of unwanted responses. If confirmed, these variability measures may help anesthesia providers by highlighting periods of inadequate analgesia (pain relief).

Condition or disease

Detailed Description:

Anesthesia providers have been using processed EEG parameters (brain monitors) to assess the depth of anesthesia for many years. The Bispectral Index (BIS®; Aspect Medical Systems, Inc.), one such brain monitor, provides a direct measure of the hypnotic state of the patient [1, 2]. These clinicians use the BIS value, a number ranging from 0 (very deep anesthesia) to 100 (awake state), to help optimize anesthetic dosing. Using BIS technology, anesthesia providers may adjust anesthesia doses to provide adequate sedation while avoiding over sedation, resulting in faster recovery [3] and a reduced incidence of awareness with recall [4].

While BIS technology helps anesthesia providers achieve desired levels of hypnosis, they currently rely primarily on monitoring hemodynamic (blood pressure and heart rate), autonomic (tearing, sweating), and somatic (moving) responses to noxious (painful) stimulation as a means to detect potential patient arousals. Additional analgesics (narcotics, NSAIDS) are often administered in order to suppress further response to noxious (painful) stimulation. Several studies have shown that noxious stimulation can also affect EEG signals, resulting in increased variability in the BIS index, suggesting that information in EEG signals could potentially help clinicians anticipate and detect patient response to noxious stimulation.

Ropcke et al. [5] showed that BIS values were higher with surgical stimulation than without any stimulation. Other reports have shown that focal noxious stimuli in volunteers and patients induce transient increases in BIS [6-9]. Many of these studies show that adding analgesics suppresses the BIS response to noxious stimulation, and the level of suppression achieved was related to the dose of the added drugs [6, 8, 9].

Based on these findings, it is expected that insufficient analgesia would likely result in transient increases in BIS due to ongoing surgical stimulation, increasing the overall variability of BIS. Recently reported findings confirm that overall variability of BIS increased prior to and following intraoperative somatic events [10]. These reports also identified similar increases in variability of the EMG, with the largest changes realized from a Composite Variability Index (CVI) which combined the BIS variability (sBIS) and EMG variability (sEMG) into a single value. Other studies have also shown an association between these variability measures and postoperative pain scores [11, 12]. These studies showed that sBIS, sEMG, and CVI computed over the entire surgical procedure were all higher in both adults and children with worse postoperative pain scores. However, the reliability and optimum method of displaying these variability scores has yet to be been determined.

The present study is designed to compare whether sBIS, sEMG, or CVI can be used to predict unwanted intraoperative somatic responses to stimulation, and to determine whether these values are related to patient-assessed postoperative pain scores. Our hypothesis is that increases in these variability measures are associated with increased probability of somatic responses. If our hypothesis is confirmed, these variability measures may help clinicians by highlighting periods of inadequate analgesia.

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Study Type : Observational
Actual Enrollment : 120 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: "Advance": Assessment for Defining Variability in Anesthesia
Study Start Date : May 2008
Actual Primary Completion Date : October 2008
Actual Study Completion Date : October 2008

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients, aged 18-80, under general anesthesia for a moderately painful elective surgical procedure.

Inclusion Criteria:

  1. Age range 18-80 years old
  2. ASA I through III
  3. Scheduled for elective, non-cardiac surgery under General Anesthesia
  4. Ability to understand and perform all recovery assessments and procedures

Exclusion Criteria:

  1. Subjects with known neurological disorders, including current use of anticonvulsant medications.
  2. Subjects with uncontrolled hypertension or other serious medical conditions which would interfere with cardiovascular responses analysis. Subjects on anti-arrhythmics, beta-blockers, or other agents which may reduce the cardiovascular responsiveness to pain and surgical stress.
  3. Patients with any contraindications to the selected anesthetic agents specified for each site.
  4. Alcohol or illicit drug use which prevents normal functioning in society or has lead to organ toxicity. Chronic use of opioids, narcotics or analgesics which may limit a subject's responsiveness to analgesic dosages.
  5. Significant hypotension (systolic BP < 100) or bradycardia (HR < 55) during baseline assessment.
  6. Anticipated or planned regional block or extensive local anesthetic for post-operative pain control.

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): NCT00689130

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United States, Georgia
Emory University School of Medicine
Atlanta, Georgia, United States, 30322
United States, Kentucky
University of Louisville
Louisville, Kentucky, United States, 40202
United States, New York
Saint Vincent Catholic Medical Center
New York, New York, United States, 10011
Hospital Sanitas La Moraleja Sanchinarro
Madrid, Spain
Sponsors and Collaborators
Medtronic - MITG
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Principal Investigator: Donald Matthews, MD Saint Vincent Catholic Medical Center, New York, New York

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Responsible Party: Medtronic - MITG Identifier: NCT00689130    
Other Study ID Numbers: 251
First Posted: June 3, 2008    Key Record Dates
Last Update Posted: March 7, 2012
Last Verified: November 2008
Keywords provided by Medtronic - MITG:
Bispectral Index
BIS Variability
Monitoring, Intraoperative
Pain, Postoperative
Somatic Events
Patients under general anesthesia undergoing a moderately painful procedure.
Additional relevant MeSH terms:
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Central Nervous System Depressants
Physiological Effects of Drugs