This is an observational research study whose purposes are to see:
- if 40 Hyperbaric Oxygen Therapy sessions at 1.5 atmospheres (HBOT 1.5) or more (60, or 80 HBOT's) help, worsen, or have no effect on subjects with chronic TBI/PCS (Traumatic Brain Injury/Post-Concussion Syndrome) and/or PTSD (Post-Traumatic Stress Disorder).
- if improvements or worsening of symptoms can be recorded with computerized and written tests for memory and thinking, and with questionnaires about the subject's quality of life and health.
- determine the long-term outcome of the treatment.
- confirm, in large numbers of study participants at multiple sites nationwide, the strong positive results obtained in pilot studies