Hyperbaric Oxygen Therapy for Veterans With TBI and PCS: A Biomarker Study

The goal of this study is to examine changes in blood biomarkers following hyperbaric oxygen therapy (HBOT) in military veterans with traumatic brain injury and persistent post-concussive symptoms. The main questions it aims to answer are: 1. Does HBOT produce measurable changes in inflammatory, neurotrophic, and neuronal injury biomarkers from baseline to completion of a 40-session treatment protocol in veterans with TBI and PCS? 2. Does the presence of comorbid PTSD influence biomarker responses to HBOT among veterans with TBI and PCS? Participants will: Complete medical and behavioral health evaluations to determine eligibility. Provide blood samples before treatment and after the final session. Receive 40 HBOT sessions at 2.0 ATA, generally two sessions per day with at least four hours between sessions. Approximately 34 veterans will participate. All participants will receive HBOT; there is no comparison group.