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Brain Retraction Monitoring Sensor Study

This study has been completed.
Information provided by:
Vanderbilt University Identifier:
First received: September 17, 2008
Last updated: July 26, 2011
Last verified: July 2011
The purpose of this study is to utilize a sensor incorporated into a brain retractor blade to monitor electrical activity and pressure applied to the brain during retraction required for the selected skull base operations. The overall goal of the study is to develop a protocol and guidelines to prevent the development of brain retraction injury during neurosurgical procedures requiring significant retraction.

Condition Intervention
Brain Surgery Requiring Significant Retraction of the Brain Device: Brain Retraction Monitoring Sensor

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Brain Retraction Monitoring Sensor

Further study details as provided by Vanderbilt University:

Primary Outcome Measures:
  • Duration and intensity of brain retraction pressure [ Time Frame: Intraoperative ]

Secondary Outcome Measures:
  • Cortical DC potential [ Time Frame: Postoperative ]
  • Local Electrocorticography (ECoG) [ Time Frame: Postoperative ]
  • Radiographic retraction injury [ Time Frame: Postoperative ]
  • Clinical deficits [ Time Frame: Postoperative ]

Estimated Enrollment: 40
Study Start Date: September 2008
Study Completion Date: June 2011
Primary Completion Date: June 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Device: Brain Retraction Monitoring Sensor
    This is a sensor incorporated into a brain retractor blade to monitor electrical activity and pressure applied to the brain during retraction required for the selected skull base operations.
Detailed Description:
During neurosurgical operations for aneurysms, tumors, or other lesions located in the skull base, the surgeon must employ retracting devices in order to displace one or more lobes of the brain enough to gain adequate surgical exposure. These retractors are adjusted by hand to optimize exposure. It is often difficult for the surgeon to gauge the amount of pressure actually applied to the brain during such placement of the retractor. Moreover, it is also possible to position the blade of the retractor inadvertently such that a focal pressure point occurs at the tip of the retractor blade against the brain. Thus, injury to the brain can occur as a result of brain retraction when either the force applied is excessive or when the pressure is not adequately distributed to a large enough area of brain. This injury is thought to be the result of ischemia (inadequate blood flow) caused by the retraction, local trauma, or a combination of both. It has been estimated that this type of brain retraction injury occurs in approximately 10% of major cranial base tumor procedures or 5% of intracranial aneurysm surgeries. The specific aim of this research is to identify changes in electrical activity of brain tissue subjected to necessary retraction during neurosurgical procedures that may give forewarning of imminent brain retraction injury. It is anticipated that this information will permit development of guidelines that will enable the neurosurgeon to take steps to minimize such injury, i.e., by temporarily releasing or otherwise modifying the brain retraction. Cerebral electrical activity, together with the amount of retraction pressure being applied, will be recorded directly from the tissue at risk by means of a silastic electrode grid containing a pressure monitor placed on the surface of the cerebral cortex underneath the retractor blade.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • A patient must be scheduled to undergo skull base surgery requiring significant brain retraction
  • Informed Consent

Exclusion Criteria:

  • None, other than patients in whom major surgical complications are encountered that are unrelated to brain retraction may be excluded from subsequent data analysis
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00754754

United States, Indiana
Methodist Hospital
Indianapolis, Indiana, United States, 46206
United States, Tennessee
Vanderbilt University Medical Center
Nashville, Tennessee, United States, 37232
United States, Virginia
Inova Fairfax Hospital
Falls Church, Virginia, United States, 22042-3300
Sponsors and Collaborators
Vanderbilt University
Principal Investigator: Michael J Ayad, MD, PhD Vanderbilt University Medical Center
  More Information

Responsible Party: Michael J. Ayad, MD, PhD, Vanderbilt University Medical Center Identifier: NCT00754754     History of Changes
Other Study ID Numbers: IRB 050960
BRI IFH 04.073
Study First Received: September 17, 2008
Last Updated: July 26, 2011

Keywords provided by Vanderbilt University:
monitoring processed this record on July 19, 2017