What can cause a tension pnumocephalus ?
Unrelated to the use of N2O, there can be a tension pnumocephalus post-op. When dura is open, air is entering the cranium. Surgeon has resected tumor, big empty space, and closed the dura. What happens post-op there will be edema, fluid accumulation and a tension pneumocephalus can occur w/ or w/out N2O. This can cause delayed recovery of consciousness.