Minimum Alveolar Concentrations of Sevoflurane for Maintaining Bispectral Index Below 50 in Morbidly Obese Patients

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: NCT01388296
Recruitment Status : Unknown
Verified December 2013 by Ahed ZEIDAN, Procare Riaya Hospital.
Recruitment status was:  Recruiting
First Posted : July 6, 2011
Last Update Posted : December 3, 2013
Information provided by (Responsible Party):
Ahed ZEIDAN, Procare Riaya Hospital

Brief Summary:
the target of this study is to assess the minimum alveolar concentration of sevoflurane to maintain theBispectral Index below 50.The minimum alveolar concentration (MAC) for maintaining Bispectral Index below 50 (MACBIS50) of sevoflurane has been reported previously in adult with Body Mass Index ( BMI) < 40 to be 0.97 and in enfant to be 2.83%, However, there is no study assessed theBispectral Index below 50 (MACBIS50 ) in morbidly obese patient (BMI > 40). The first aim of our study is to assess the MACBIS50 of sevoflurane in morbidly obese patients BMI 40 - 70 using the Continuous Reassessment Method (CRM) in 80 % of patients.

Condition or disease

Detailed Description:

After ethical committee approval and written informed consent, 30 morbidly obese adult patients , BMI 40- 70Kg/m², ASA physical status 1 and 2 , aged 18-49 yr, , undergoing elective bariatric surgery under general anesthesia using sevoflurane, were included in this study.

Monitoring consisted of noninvasive blood pressure, Electrocardiogram (ECG) , pulse oximetry, and BIS. All subjects received a standard dose of 2 mcg/kg fentanyl approximately 20 min before induction of general anesthesia. a standard BIS® monitor strip was applied before fentanyl administration and induction of general anesthesia. Induction was performed in all patients with 2m/kg propofol, 0.2 mg/kg cisatracuruim, followed by direct laryngoscopy and tracheal intubation. Therefore, when BIS reached > 65 , sevoflurane was started immediately at the predetermined dose.

The endtidal sevoflurane concentration was adjusted with starting dose for the first cohort patients 1% and maintained for 10 min to ensure equilibration with the cerebral anesthetic partial pressure followed by a 1-min assessment of BIS taken at 10-s intervals. Briefly, a first dose is given to the first patient and the next doses are given according to the following rule: if the subject responds positively (BIS<50), the dose is decreased one step for the next subject, and conversely, if the subject does not respond (BIS>50), the dose is increased one step. The dose adjustment is 0.2% for sevoflurane. The CRM is used to calculate the dose adjustment for every cohort with the number of patients for every cohort .

Study Type : Observational
Estimated Enrollment : 30 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Minimum Alveolar Concentrations of Sevoflurane for Maintaining Bispectral Index Below 50 in Morbidly Obese Patients
Study Start Date : June 2011
Estimated Primary Completion Date : December 2013
Estimated Study Completion Date : December 2013

Resource links provided by the National Library of Medicine

Drug Information available for: Sevoflurane
U.S. FDA Resources

Morbidly obese patients
BMI 40-50 k/m2
Morbidly obese
BMI 50-60 k/m2
Morbidly obeses
BMI 60-70 k/m2

Primary Outcome Measures :
  1. Minimal alveolar concentration of Sevoflurane for Maintaining BIS Below 50 [ Time Frame: 24 hours ]

Biospecimen Retention:   None Retained
Bisbectral index (BIS)

Information from the National Library of Medicine

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Ages Eligible for Study:   20 Years to 40 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Morbidly obese patients weighting BMI 40-70 k/m2

Inclusion Criteria:

  • morbidly obese patient
  • BMI 40-70
  • age : 20-40 year

Exclusion Criteria:

  • Age< 20 and > 40
  • BMI < 40 and > 70
  • comorbidity

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): NCT01388296

Contact: Ahed ZEIDAN, MD 009615409107

Saudi Arabia
Procare Riaya Hospital Recruiting
Al Khobar, Estern, Saudi Arabia, 3
Contact: kamal Abdulkhalek, MD    00966505814754   
Sponsors and Collaborators
Procare Riaya Hospital
Study Chair: Ahed ZEIDAN, MD Procare Riaya Hospital

Responsible Party: Ahed ZEIDAN, MD, Procare Riaya Hospital Identifier: NCT01388296     History of Changes
Other Study ID Numbers: PRH 03
First Posted: July 6, 2011    Key Record Dates
Last Update Posted: December 3, 2013
Last Verified: December 2013

Additional relevant MeSH terms:
Platelet Aggregation Inhibitors
Anesthetics, Inhalation
Anesthetics, General
Central Nervous System Depressants
Physiological Effects of Drugs