- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04012463
Neural and Behavioral Sequelae of Blast-Related Traumatic Brain Injury
Hypothesis 1: On fMRI scanning, frontoparietal activation during performance of executive function tasks of working memory, inhibitory control processes, and stimulus-response interference will exhibit greater signal intensity, a wider spatial extent, and more bilateral activation in chronic MTBI than chronic OI participants.
Hypothesis 2: DTI changes, characterized by lower FA and higher MD at the gray-white junction, corpus callosum, central semiovale, and internal capsule, will be seen in MTBI but not in OI subjects.
Hypothesis 3: Increased fMRI activation in chronic MTBI will be correlated with location and severity of disrupted fiber tracks that subserve neural networks associated with each fMRI activation task.
Hypothesis 4: Performance on computerized neuropsychological testing (ANAM) and reaction time measures on fMRI tasks will better discriminate MTBI from OI than standard paper-and pencil tests.
Hypothesis 5: The combination of fMRI, DTI, and ANAM will better discriminate MTBI from OI than each individual method.
Hypothesis 6: More severe brain pathology in MTBI, as measured by neuroimaging (fMRI, DTI) and ANAM test scores, will be associated with less severe PTSD and symptoms.
Study Overview
Status
Conditions
Detailed Description
Traumatic brain injuries (TBI) are a common occurrence from roadside blasts of improvised explosive devices (IEDs). Like civilian TBI, blast-related TBI can result from mechanical forces in which objects in motion strike the head or the head is forcefully put into motion and strikes an object. TBI from exposure to an explosive blast may also result from a third cause: barotrauma. Blasts produce wave-induced changes in atmospheric pressure, which in turn produce characteristic injuries to vulnerable bodily regions at air-fluid interfaces, such as the middle ear. It is unknown whether the neural and cognitive sequelae of blast-related TBI differ from those resulting from mechanically-induced TBI commonly observed in civilian accidents. Understanding the potentially unique sequelae of blast-related TBI is critical for accurate diagnosis and designing effective pharamacological and neurorehabilitation interventions.
In the proposed cross-sectional study, we aim to apply neurobehavioral testing and advanced MRI techniques [task-activated functional MRI (fMRI) and diffusion tensor imaging (DTI)] to gain a comprehensive understanding of the neural changes underlying blast-related MTBI. This will be accomplished by comparing neurobehavioral and neuroimaging findings obtained from military personnel who have experienced a blast injury with those obtained from civilians who have experienced TBI from motor vehicle accidents and from military and civilian control participants with orthopedic injuries. We will accomplish this goal by conducting advanced neuroimaging (task-activated fMRI and DTI fiber tracking) and neurobehavioral testing (computerized assessment and standard neuropsychological testing) on 120 chronic trauma patients: 30 military MTBI patients who have experienced blast injuries, 30 civilian MTBI patients with mechanical closed head injuries, and 30 military and 30 civilian patients with orthopedic injuries.
Study Type
Enrollment (Actual)
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
Inclusion Criteria for milMTBI
1. GCS score 9-15 (if available) 2. Brain injury due to blast 3. Current age 18-45 4. Right-handed 5. Post-injury interval 12-72 months 6. Duration of Loss of Consciousness (LOC) < 24 hours 7. Duration of Posttraumatic Amnesia (PTA)< 7 days 8. No intracranial surgery 9. No brain lesions on computer tomography (CT) scan (if available) 10. Extracranial Injuries by Abbreviated Injury Scale (AIS) <3 (non-head)
Inclusion Criteria for civlMTBI
1. GCS score 9-15 (if available) 2. Non-blast brain injury 3. Current age 18-45 4. Right-handed 5. Post-injury interval 12-72 months 6. LOC < 24 hours 7. PTA< 7 days 8. No intracranial surgery 9. No brain lesions on CT scan (if available) 10. Extracranial Injuries by AIS <3 (non-head)
Inclusion Criteria for milControl and civOI
1. No history of brain injury 2. Non-blast extracranial injury or no injury 3. Current age 18-45 4. Right-handed 5. Post-injury interval 12-72 months 6. LOC -none 7. PTA- none 8. No intracranial surgery 9. CT scan normal (if done) 10. Extracranial Injuries by AIS <3 (non-head)
Exclusion Criteria:
1) Not fluent in English 2) Non-right hande 3) AIS score equal or higher 4 for body parts other than head 4) Neurologic deficit other than TBI (MTBI, OI groups); no LOC or PTA (MTBI groups) 5) Blood alcohol level > 200 mg/dL 6) Previous hospitalization for head injury 7) Pregnancy when screened prior to brain imaging 8) Pre-existing neurologic disorder associated with cerebral dysfunction and/or cognitive deficit (e.g., cerebral palsy, mental retardation, epilepsy) or diagnosed dyslexia 9) Pre-existing severe psychiatric disorder (bipolar disorder, schizophrenia) as determined by the Structured Clinical Interview for Depression 10) Penetrating gunshot wound to the brain 11) Contraindications to undergoing MRI, including implant of metal or marked agitation observed by research assistant. 12) Illegal alien 13) Hypoxia for 30 minutes or longer after resuscitation PO2 < 96 mmHg 14) Hypotension for 30 minutes or longer after resuscitation (systolic blood pressure more than 2SDs below mean for age)
Study Plan
How is the study designed?
Design Details
- Observational Models: Case-Control
- Time Perspectives: Other
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Brain activation on Stop Signal Reaction Time Task (SSRT)
Time Frame: 12-24 months post-injury
|
fMRI measuring brain activation associated with performance of SSRT
|
12-24 months post-injury
|
Brain activation on Sternberg Item Recognition Task (SIRT)
Time Frame: 12-24 months post-injury
|
fMRI measuring brain activation associated with performance of SIRT
|
12-24 months post-injury
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Neurobehavioral Symptom Inventory
Time Frame: 12-24 months post-injury
|
self-report of various domains of emotional status
|
12-24 months post-injury
|
Post-traumatic Symptom Checklist-Civilian (PCL-C)
Time Frame: 12-24 months post-injury
|
Checklist of posttraumatic stress symptoms
|
12-24 months post-injury
|
Center for the Epidemiological Center for Study of Depression (CES-D)
Time Frame: 12-24 months post-injury
|
Self-report measure of depression
|
12-24 months post-injury
|
Symbol Digit Modalities Test (SDMT)
Time Frame: 12-24 months post-injury
|
Measure of processing speed
|
12-24 months post-injury
|
Trail Making Test A and B
Time Frame: 12-24 months post-injury
|
Measure of visuoperceptive performance and speed
|
12-24 months post-injury
|
Controlled Oral Word Association
Time Frame: 12-24 months post-injury
|
Measure of verbal fluency
|
12-24 months post-injury
|
California Verbal Learning Test 2
Time Frame: 12-24 months post-injury
|
Verbal learning test
|
12-24 months post-injury
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Harvey Levin, PhD, Baylor College of Medicine
- Principal Investigator: Steven Rao, PhD, The Cleveland Clinic
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- PT074924P1
- H-22852 (Baylor College of Medicine)
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