Use of nitrous oxide is contraindicated in all of the following surgeries except –: (A) Cochlear implant, (B) Microlaryngeal surgery, (C) Vitrioretinal surgery, (D) Exentration operation
Answer is D. Exentration is enucleation along with wide dissection of periorbital tissue. There is no air containing cavity or dead space formation, therefore N2O is not contraindicated.
N2O is contraindicated in :- Pneumothorax, pneumoperitoneum, emphysema, volvulus, acute intestinal obstruction, microlaryngeal surgeries, Middle ear surgery, tympanoplasties, posterior fossa surgery, laproscopy surgery, pneumoencephalum, vitrolental surgery.