Definition Entrance of nitrous oxide into cavities filled with gas (ex. bowel) can lead to an increase in pressure. After intravitreal injection of sulfur hexafluoride (colorless, odorless, non-flammable gas) or perfluoropropane (C3F8), nitrous oxide may increase intraocular pressure. This can be dangerous because ocular perfusion pressure (difference between arterial blood pressure and IOP) may be critically decreased. Regarding sulfur […]