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Cognitive Effects of Inhalational Versus Intravenous General Anesthesia in the Elderly

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ClinicalTrials.gov Identifier: NCT00788008
Recruitment Status : Completed
First Posted : November 10, 2008
Results First Posted : March 26, 2015
Last Update Posted : March 26, 2015
Information provided by (Responsible Party):

Study Description
Brief Summary:
The purpose of this research is to determine if post-operative cognition will be better if the general anesthesia for surgery is done with an inhaled (gas through a breathing tube) or intravenous (medicine injected in the IV) general anesthetic technique.

Condition or disease Intervention/treatment
Lumbar Spondylosis Cervical Spondylosis Hip Osteoarthritis Knee Osteoarthritis Drug: inhalation anesthesia with isoflurane vs. TIVA with propofol

Detailed Description:

A prospective randomized pre-test post-test design will be used. After obtaining informed consent, patients will be randomized to either: 1) Inhalational anesthesia with isoflurane or 2) Total intravenous anesthesia(TIVA) with propofol. Randomization will be stratified by surgical type so that this variable is equally distributed between the treatment groups. All patients will be maintained at a standard depth of anesthesia (40-60) using a Bispectral Index (BIS®) monitor. Normocarbia will be maintained in the operating room using capnography monitoring. Normothermia will be maintained throughout the procedure.

The anesthesia team providing care for these patients will be able to choose the premedication and muscle relaxant for the anesthetic technique. Patient controlled anesthesia or regional anesthetic techniques may be used for post-operative analgesia at the discretion of the anesthesia team providing care for these patients. Anesthesia will be induced with intravenous propofol and fentanyl in all patients, unless contraindicated. Patients will be mechanically ventilated with air/oxygen. Temperature will be maintained > 35º C and ventilation will be adjusted to maintain end-tidal carbon dioxide (CO2) at 35 ± 5 mmHg. Mean arterial pressure will be maintained ≥ 75% of baseline or ≥ 60 mmHg, whichever is greater, in both groups. After induction of anesthesia, the maintenance anesthesia will consist of either:

  1. Inhalational anesthesia group - isoflurane will be used for maintenance of anesthesia. Intravenous fentanyl and/or remifentanil will be used for supplementary analgesia. These agents will be administered to maintain a normal depth of anesthesia using the BIS® monitor and traditional signs of anesthetic depth.
  2. TIVA group - propofol and opioid infusions (fentanyl or remifentanil) will be used for the maintenance of anesthesia. The infusions will be adjusted to maintain a normal depth of anesthesia using the BIS® monitor along with traditional signs of anesthetic depth.

All subjects will undergo pre-operative neurocognitive testing within two weeks of their surgery, and at 3 months post-surgery. The persistence versus resolution of cognitive deficits over time will be determined with a 1 year post-surgical follow-up assessment. Pre- to post-test change scores will be compared across groups on primary and secondary outcome variables (see below) while controlling for relevant demographic variables (age, education, sex).

Study Design

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 200 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Does Inhalational Anesthesia Accelerate Postoperative Cognitive Decline?
Study Start Date : November 2008
Primary Completion Date : December 2013
Study Completion Date : December 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Anesthesia
U.S. FDA Resources

Arms and Interventions

Arm Intervention/treatment
Active Comparator: 1
Inhalational anesthesia with isoflurane
Drug: inhalation anesthesia with isoflurane vs. TIVA with propofol
variable depending upon patient
Other Name: Diprivan
Active Comparator: 2
total intravenous anesthesia with propofol
Drug: inhalation anesthesia with isoflurane vs. TIVA with propofol
variable depending upon patient
Other Name: Diprivan

Outcome Measures

Primary Outcome Measures :
  1. Change in Neurocognitive Performance (Z-score) [ Time Frame: 3 months post operatively ]

    Mean change on composite scores (z-score) for memory and executive function measures.

    Memory measures: Hopkins Verbal Learning Test-Revised and the Brief Visuospatial Memory Test-Revised.

    Executive function measures: the Trail Making Test (Army, 1944), Digit-symbol substitution and Symbol Search subtests of the Processing Speed Index of the Wechsler Adult Intelligence Scale-III (WAIS-III; Wechsler, 1997) and the Controlled Oral Word Association subtest of the Multilingual Aphasia Examination.

    The outcomes were constructed as summed z-score composites. They are scaled as standard deviations. Thus, a score of 0 was central on each composite, and 95% of the scores would fall within -2.0 and +2.0. While there is no minimum or maximum value is rare for any score (<1%) to fall outside the -3.0 to +3.0 range.

    Higher scores (and thus positive change value) indicate an improvement of function.

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   65 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • patients (aged 65 years or older) scheduled for elective spine or major joint replacement (total hip or total knee arthroplasty) at Duke University Medical Center or the Durham VA Medical Center

Exclusion Criteria:

  • not fluent in English and able to comprehend the English language
  • have severe visual or auditory handicaps
  • Carry a diagnosis of dementia or score < 18 on the Mini-Mental State Examination (MMSE) as calculated from the Modified Mini-Mental State (3MS) (see D4 below)
  • have allergies to eggs, propofol, isoflurane, fentanyl, remifentanil, or pregabalin
Contacts and Locations

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 ClinicalTrials.gov identifier (NCT number): NCT00788008

United States, North Carolina
Duke University Medical Center
Durham, North Carolina, United States, 27710
Durham, North Carolina, United States, 27710
Sponsors and Collaborators
Duke University
VA Office of Research and Development
Principal Investigator: Terri G Monk, MD Duke University
More Information

Responsible Party: Duke University
ClinicalTrials.gov Identifier: NCT00788008     History of Changes
Other Study ID Numbers: Pro00010070
First Posted: November 10, 2008    Key Record Dates
Results First Posted: March 26, 2015
Last Update Posted: March 26, 2015
Last Verified: March 2015

Keywords provided by Duke University:
spinal, joint

Additional relevant MeSH terms:
Osteoarthritis, Knee
Osteoarthritis, Hip
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases
Spinal Diseases
Bone Diseases
Central Nervous System Depressants
Physiological Effects of Drugs
Hypnotics and Sedatives
Anesthetics, Intravenous
Anesthetics, General
Anesthetics, Inhalation