Traumatic brain injuries (TBI) are a major cause of morbidity and mortality worldwide. Due to
improvements in emergency medical care, transportation and specialized trauma facilities, the
number of people surviving TBI with impairment has significantly increased in recent years.
The long term cognitive sequelae, which are often not visible persist far beyond the
resolution of the obvious physical disabilities. This combined with the relatively low
awareness of the general public has designated TBI as the "silent epidemic" (TBI CDC 2006).
Hyperbaric oxygen therapy (HBOT) has been suggested as a possible treatment modality for
these cases and preliminary studies are promising.

The purpose of this study is to evaluate the effectiveness of HBOT in the treatment of
chronic mild traumatic brain injuries (mTBI). Sequential SPECT scans of the brain and
neurocognitive testing will be used to evaluate cerebral blood flow (CBF) response, cognitive
and functional improvement following treatment.