Hormone Deficiency After Brain Injury During Combat

The prevalence of hypopituitarism after combat-related traumatic brain injury (TBI) is
currently unknown. Recent civilian data on TBI show the prevalence of any pituitary hormone
deficiency is as high as 80% after 12 months. While the military prevalence of
hypopituitarism can be extrapolated from civilian data, a major limitation is the notably
different mechanism of injury (i.e., blast) for military personnel compared to civilians
(i.e., assaults, traffic accidents and falls). Little is known about the effect of
shockwaves from a blast injury on central nervous system tissue, and due to the unique
nature of blast-related TBI, the prevalence of pituitary dysfunction in affected service
members may significantly differ from nonmilitary subjects in prior studies.

Inclusion Criteria:

- Combat veterans who are 3 or 6 months post combat-related TBI and age 18yrs or older

- Must demonstrate capacity for informed consent

- Must be DEERS eligible (Military healthcare beneficiary)

Exclusion Criteria:

- Pregnancy (to be assessed by urine HCG)

- Use of hormonal contraceptives

- Chronic oral or intravenous glucocorticoids

- Use of hormonal therapy to include estrogen and testosterone

- Prior diagnosis of hypopituitarism prior to combat related TBI