- No reduction in cerebral metabolism as a result of early moderate hyperventilation following severe traumatic brain injury. Diringer, M.N., Yundt, K., Videen, T.O., Adams, R.E., Zazulia, A.R., Deibert, E., Aiyagari, V., Dacey, R.G., Grubb, R.L., Powers, W.J. J. Neurosurg. (2000)