Concussion Clinical Subtypes and Modifiers: A Framework for Longitudinal Study of Low-Level Blast Exposure

Area of Science:

• Military medicine
• Neuroscience
• Occupational health

Background:

• Blast overpressure (BOP) exposure is a growing concern for U.S. military personnel, particularly Special Operations Forces (SOF), due to operational demands.
• Current diagnostic challenges exist for BOP-related brain injury, often considered on a continuum with mild traumatic brain injury (concussion), complicating management.
• Congressional actions highlight the need for improved BOP risk management, surveillance, and research.

Purpose of the Study:

• To propose a conceptual framework for the longitudinal study and management of BOP-related effects in military personnel.
• To adapt the successful clinical subtype approach used in concussion care for BOP exposure.
• To integrate exposure monitoring, clinical evaluation, and biomarkers for a comprehensive understanding of BOP impacts.

Main Methods:

• Leveraging a symptom-based classification framework, adapted from concussion clinical subtypes (vestibular, ocular-motor, cognitive, anxiety/mood, post-traumatic headache).
• Integrating baseline assessments, continuous exposure monitoring, and serial clinical evaluations.
• Incorporating emerging biomarkers and advanced neuroimaging techniques for objective assessment.

Main Results:

• The proposed framework aims to standardize the study and management of BOP effects.
• It facilitates understanding of heterogeneous symptom presentations and informs targeted treatments.
• The approach supports return-to-duty decisions and risk management strategies.

Conclusions:

• A standardized, subtype-informed longitudinal approach is crucial for understanding BOP-related effects.
• This framework can enhance clinical decision-making, improve outcomes, and inform evidence-based policies.
• Adoption of this approach will aid in protecting brain health, optimizing performance, and enhancing military readiness.