Residual pituitary function after brain injury-induced hypopituitarism:: A prospective 12-month study

Context: Traumatic brain injury ( TBI) and subarachnoid hemorrhage ( SAH) are conditions at high risk for the development of hypopituitarism. Objective: The objective of the study was to clarify whether pituitary deficiencies and normal pituitary function recorded at 3 months would improve or worsen at 12 months after the brain injury. Design and Patients: Pituitary function was tested at 3 and 12 months in patients who had TBI ( n = 70) or SAH ( n = 32). Results: In TBI, the 3- month evaluation had shown hypopituitarism ( H) in 32.8%. Panhypopituitarism ( PH), multiple ( MH), and isolated ( IH) hypopituitarism had been demonstrated in 5.7, 5.7, and 21.4%, respectively. The retesting demonstrated some degree of H in 22.7%. PH, MH, and IH were present in 5.7, 4.2, and 12.8%, respectively. PH was always confirmed at 12 months, whereas MH and IH were confirmed in 25% only. In 5.5% of TBI with no deficit at 3 months, IH was recorded at retesting. In 13.3% of TBI with IH at 3 months, MH was demonstrated at 12- month retesting. In SAH, the 3- month evaluation had shown H in 46.8%. MH and IH had been demonstrated in 6.2 and 40.6%, respectively. The retesting demonstrated H in 37.5%. MH and IH were present in 6.2 and 31.3%, respectively. Although no MH was confirmed at 12 months, two patients with IH at 3 months showed MH at retesting; 30.7% of SAH with IH at 3 months displayed normal pituitary function at retesting. In SAH, normal pituitary function was always confirmed. In TBI and SAH, the most common deficit was always severe GH deficiency. Conclusion: There is high risk for H in TBI and SAH patients. Early diagnosis of PH is always confirmed in the long term. Pituitary function in brain- injured patients may improve over time but, although rarely, may also worsen. Thus, brain- injured patients must undergo neuroendocrine follow- up over time.