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A Mouse Model of Single and Repetitive Mild Traumatic Brain Injury
Published on: June 20, 2017
Natural history of the long-term cognitive, affective, and physical sequelae of mild traumatic brain injury
Abstract:
Mild traumatic brain injury (MTBI) is associated with cognitive,affective, and physical sequelae. When symptoms persist for more than 3 months, a diagnosis of Post-Concussion Syndrome (PCS) is often given. The current study tracked symptom development to explore the natural sequelae of MTBI. Twenty-six MTBI patients received a comprehensive neuropsychological assessment at three intervals: within 1 week, at 4 months and at 7 months post-concussion. Based on DSMIV criteria and clinical judgment, two external raters diagnosed five MTBI participants with PCS. Results suggested that aspects of cognitive functioning of the symptomatic MTBI (i.e., PCS) participants were different from matched normal control (NC) subjects, and from the 21 MTBI patients who were asymptomatic, at 4 months. Asymptomatic MTBI participants improved in overall level of functioning from 4 to 7 months, but remained significantly different from NC participants in their reduced verbal fluency and working memory functioning.
Insights
Mild traumatic brain injury (MTBI) can lead to persistent symptoms, diagnosed as Post-Concussion Syndrome (PCS). Even asymptomatic MTBI patients show lasting cognitive deficits in verbal fluency and working memory.
Area of Science:
- Neuroscience
- Psychology
Background:
- Mild traumatic brain injury (MTBI) can result in cognitive, affective, and physical symptoms.
- Persistent symptoms beyond 3 months may lead to a Post-Concussion Syndrome (PCS) diagnosis.
Purpose of the Study:
- To investigate the natural course of sequelae following MTBI.
- To differentiate cognitive functioning between symptomatic (PCS) and asymptomatic MTBI patients and normal controls.
Main Methods:
- Twenty-six MTBI patients underwent neuropsychological assessments at 1 week, 4 months, and 7 months post-injury.
- Five participants were diagnosed with PCS based on DSM-IV criteria and clinical judgment.
- Symptomatic (PCS) and asymptomatic MTBI groups were compared to matched normal controls (NC).
Main Results:
- At 4 months, symptomatic MTBI (PCS) participants exhibited cognitive differences compared to both NC and asymptomatic MTBI subjects.
- Asymptomatic MTBI participants showed functional improvement between 4 and 7 months.
- Despite improvement, asymptomatic MTBI participants still demonstrated significantly reduced verbal fluency and working memory compared to NC.
Conclusions:
- Cognitive deficits are present in symptomatic MTBI (PCS) patients at 4 months post-injury.
- Even asymptomatic MTBI patients may experience persistent, though less severe, cognitive impairments.
- Longitudinal monitoring is crucial for understanding the full spectrum of MTBI recovery and identifying persistent deficits.
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