title: Endotracheal tube obstruction by nitrous oxide.
mesh_terms: D000402:Airway Obstruction / Q000209:etiology*; D006801:Humans; D007432:Intraoperative Period; D007442:Intubation, Intratracheal / Q000009:adverse effects* / Q000295:instrumentation; D008297:Male; D008875:Middle Aged; D009609:Nitrous Oxide
chemical_list: D009609:Nitrous Oxide