Vitamin D influences many other physiological processes, including muscle function, cardiovascular homeostasis, nerve function, and immune response. Furthermore, accumulated evidence suggests that vitamin D also mediates the immune system response to infection. Infections are very common in patients from neurosurgical intensive care unit.
A recent study published in the Neural Regeneration Research (Vol. 8, No. 16, 2013) detected serum vitamin D level in 15 patients with clinically suspected infection and 10 patients with confirmed infection, who came from neurosurgical intensive care unit. Serum level of 25-hydroxyvitamin D, the primary circulating form of vitamin D, was significantly decreased in patients with suspected or confirmed infection after a 2-week neurosurgical intensive care unit hospitalization, while serum level of 1,25-dihydroxyvitamin D, the active form of vitamin D, was significantly decreased in patients after a four-week neurosurgical intensive care unit hospitalization.
These findings suggest that vitamin D deficiency is linked to the immunological status of neurosurgical intensive care unit patients and vitamin D supplementation can improve patient's immunological status.
Reference: Yi HJ, Jeong JH, Jin ES, Shin IY, Hwang HS, Moon SM. Evaluation of vitamin D level in patients from neurosurgical intensive care unit. Neural Regen Res. 2013;8(16):1528-1534.