Noninvasive Monitoring of Cerebral Blood Flow Autoregulation in Patients With Traumatic Brain Injury (TBI) (REG01)

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: NCT01605838
Recruitment Status : Withdrawn (A series of administrative delays on all sides involved, combined with funding problems.)
First Posted : May 25, 2012
Last Update Posted : January 14, 2015
University of Southern California
Information provided by (Responsible Party):
Advanced Brain Monitoring, Inc.

May 22, 2012
May 25, 2012
January 14, 2015
August 2012
June 2013   (Final data collection date for primary outcome measure)
Extended Glasgow Outcome Scale (GOSE) [ Time Frame: 3 months post-injury ]
Same as current
Complete list of historical versions of study NCT01605838 on Archive Site
  • Neurobehavioral Symptom Inventory (NSI) [ Time Frame: 3 months post-injury ]
  • Rappaport Disability Rating Scale (DSR) [ Time Frame: At discharge from intensive care unit; on average, 10 days post-injury ]
    Note regarding the time frame: based on the USC patient database for 2010 and 2011, patients may be discharged from the ICU anywhere between 4 days to 4 weeks; 50% of them will spend 10 +/- 3 days in the ICU.
  • Katz Index of Independence in Activities of Daily Living (KI-ADL) [ Time Frame: 3 months post-injury ]
Same as current
Not Provided
Not Provided
Noninvasive Monitoring of Cerebral Blood Flow Autoregulation in Patients With Traumatic Brain Injury (TBI)
Pilot (Feasibility) Study of New Portable Monitor for Continuous Assessment of Cerebral Blood Flow (CBF) Autoregulation in Patients With Moderate to Severe Traumatic Brain Injury (TBI)

BACKGROUND: The brain is very sensitive to both excessive and insufficient flow of blood. Cerebral blood flow (CBF) is normally auto-regulated by the blood vessels in the brain, but this protective mechanism is often disturbed after a traumatic brain injury (TBI). Impairment or loss of the CBF autoregulation makes the brain vulnerable to oscillations of either arterial blood pressure (ABP) or intracranial pressure (ICP). The ideal management of TBI patients, therefore, involves continuous measurement and management of the cerebral perfusion pressure (CPP = ABP - ICP) but the measurement of CPP is currently possible only with specialized equipment and expertise that is not available in all institutions. The investigators have converted a no-longer used system that continuously monitors CBF autoregulation using rheoencephalography (REG) technology into a modern, small, battery-powered, low-cost monitor (aka BM-1) that acquires the REG signals using only noninvasive electrodes placed on the skin/scalp. REG data can then be used to calculate the optimal CPP to maintain in each individual patient. BM-1 is also capable of monitoring electroencephalography (EEG) and impedance plethysmography (IPG), which can, respectively, be used to measure brain electrical activity and changes in peripheral blood flow caused by blood pressure changes.

OBJECTIVES: The primary objectives are to (Obj. 1) demonstrate that REG acquired noninvasively is equal to the well-established but invasive method using intracranial pressure (ICP) monitoring, (Obj. 2) retrospectively test the idea that TBI patients have a less favorable outcome if their CPP were found less optimal using the REG data, and (Obj. 3) determine if noninvasive IPG or the PPG finger sensor monitoring (used to measure heart rate in doctor's offices) can replace the invasive monitoring of arterial blood pressure (ABP).

METHODOLOGY: This is an observational study with retrospective data analysis. 20 adult patients (18-65 yrs) with acute TBI, who meet the inclusion/exclusion criteria, will be enrolled on a first-come-first-enroll basis. The enrolled patients will have the REG, EEG and IPG signals monitored for the duration of ICU stay or 15 days, whichever is shorter. Standard neurological assessment will be made at the patient's discharge from the ICU and at 3 months after injury. The study is expected to end June 2013.

Not Provided
Observational Model: Cohort
Time Perspective: Prospective
Not Provided
Not Provided
Non-Probability Sample
Adult patients (18 - 65 years) hospitalized in the surgical intensive care unit (ICU) because of moderate to severe traumatic brain injury
Traumatic Brain Injury (TBI)
Not Provided
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
May 2014
June 2013   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Clinical diagnosis of acute moderate or severe TBI
  • Hospitalization within 12 hours from the injury
  • Intraarterial catheterization and intracranial pressure (ICP) monitoring instantiated within 72 hours from the injury

Exclusion Criteria:

  • Earlier head injuries, stroke, space-occupying intracranial lesions, meningitis, or cerebral vasculopathies
  • Concomitant severe injuries of the chest, abdomen, pelvis, extremities or spine
  • Concurrent terminal illness with a life expectancy of less than 6 months
  • Unlikely to survive the next 48 hours after enrollment
  • Implanted cardiac pacemaker, cardiac converter/defibrillator, or other electrical stimulator
  • Pregnancy
  • Patient is a prisoner or on a probation
Sexes Eligible for Study: All
18 Years to 65 Years   (Adult, Older Adult)
Contact information is only displayed when the study is recruiting subjects
United States
W81XWH - 10 - C - 0061 ( Other Grant/Funding Number: DOD TATRC )
Not Provided
Not Provided
Advanced Brain Monitoring, Inc.
Advanced Brain Monitoring, Inc.
University of Southern California
Principal Investigator: Djordje Popovic, MD Advanced Brain Monitoring, Inc.
Advanced Brain Monitoring, Inc.
January 2015