Use of nitrous oxide is contraindicated in all of the following surgeries except –
Cochlear implant
Microlaryngeal surgery
Vitrioretinal surgery
Exentration operation
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.