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A Novel Model of Mild Traumatic Brain Injury for Juvenile Rats
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Sex-Based Differences in Transcranial Doppler Ultrasound and Self-Reported Symptoms After Mild Traumatic Brain
Corey M Thibeault1, Samuel Thorpe1, Nicolas Canac1
1Neural Analytics, Inc., Los Angeles, CA, United States.
Frontiers in Neurology
|June 28, 2019
Summary
Sex differences in adolescent mild traumatic brain injury (mTBI) impact symptom recovery, but not objective measures. This study highlights challenges in diagnosing and tracking mTBI patients using subjective symptoms alone.
Area of Science:
- Neuroscience
- Pediatrics
- Sports Medicine
Background:
- Sex-related differences in mild traumatic brain injury (mTBI) outcomes are debated, with conflicting evidence on recovery duration.
- Previous research has not consistently identified disparities in mTBI severity or recovery timelines between sexes.
Purpose of the Study:
- To investigate sex-specific effects of mTBI on self-reported symptoms and transcranial Doppler ultrasound (TCD) metrics in adolescents.
- To explore the relationship between sex, time since injury, and mTBI-related symptoms and physiological responses.
Main Methods:
- Assessed 58 adolescent mTBI patients at various post-injury time points.
- Collected self-reported symptom data and measured middle cerebral artery velocity using TCD.
- Evaluated cerebrovascular reactivity through breath-holding challenges, calculating Pulsatility Index (PI), P2R ratio, and Breath-Hold Index (BHI).
- Employed linear mixed effects models to analyze interactions between sex, time, and TCD features, accounting for within-subject variability.
Main Results:
- Significant interactions between sex and time since injury were observed in self-reported symptoms within the first 10 days post-injury.
- These sex- and time-dependent symptom differences were not mirrored in the TCD-measured physiological features.
- No significant differences were found in TCD-derived metrics (PI, P2R, BHI) related to sex or time since injury.
Conclusions:
- Adolescent females may experience distinct patterns of symptom recovery post-mTBI compared to males, particularly in the early stages.
- Relying solely on subjective symptom reporting can be misleading for mTBI diagnosis and monitoring in adolescents.
- Further research is crucial to understand the underlying pathophysiology of sex-related differences in concussion and to develop objective diagnostic tools.
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