Neural and Behavioral Sequelae of Blast-Related Traumatic Brain Injury
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 60
- 主要终点
- Brain activation on Stop Signal Reaction Time Task (SSRT)
研究概览
简要总结
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.
详细描述
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.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Control
- 时间视角
- Other
入排标准
- 年龄范围
- 18 Years 至 45 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Inclusion Criteria for milMTBI
- •GCS score 9-15 (if available)
- •Brain injury due to blast
- •Current age 18-45
- •Right-handed
- •Post-injury interval 12-72 months
- •Duration of Loss of Consciousness (LOC) < 24 hours
- •Duration of Posttraumatic Amnesia (PTA)< 7 days
- •No intracranial surgery
- •No brain lesions on computer tomography (CT) scan (if available)
- •Extracranial Injuries by Abbreviated Injury Scale (AIS) <3 (non-head)
- •Inclusion Criteria for civlMTBI
- •GCS score 9-15 (if available)
- •Non-blast brain injury
- •Current age 18-45
- •Right-handed
- •Post-injury interval 12-72 months
- •LOC < 24 hours
- •PTA< 7 days
- •No intracranial surgery
- •No brain lesions on CT scan (if available)
- •Extracranial Injuries by AIS <3 (non-head)
- •Inclusion Criteria for milControl and civOI
- •No history of brain injury
- •Non-blast extracranial injury or no injury
- •Current age 18-45
- •Right-handed
- •Post-injury interval 12-72 months
- •No intracranial surgery
- •CT scan normal (if done)
- •Extracranial Injuries by AIS <3 (non-head)
排除标准
- •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)
结局指标
主要结局
Brain activation on Stop Signal Reaction Time Task (SSRT)
时间窗: 12-24 months post-injury
fMRI measuring brain activation associated with performance of SSRT
Brain activation on Sternberg Item Recognition Task (SIRT)
时间窗: 12-24 months post-injury
fMRI measuring brain activation associated with performance of SIRT
次要结局
- Trail Making Test A and B(12-24 months post-injury)
- Post-traumatic Symptom Checklist-Civilian (PCL-C)(12-24 months post-injury)
- Center for the Epidemiological Center for Study of Depression (CES-D)(12-24 months post-injury)
- Symbol Digit Modalities Test (SDMT)(12-24 months post-injury)
- California Verbal Learning Test 2(12-24 months post-injury)
- Neurobehavioral Symptom Inventory(12-24 months post-injury)
- Controlled Oral Word Association(12-24 months post-injury)
研究者
Harvey Levin
Professor
Baylor College of Medicine