title: Anaesthesia and tympanometry.
abstract: Nitrous oxide and intermittent positive pressure respiration prior to intubation raised the middle ear pressure in children with normal ears. In children with secretory otitis media, nitrous oxide was responsible for aeration alone and this was seen only in children with some gas present prior to surgery. Wide range tympanometry accurately predicted the findings at myringotomy.
mesh_terms: D000158:Acoustic Impedance Tests; D000769:Anesthesia, Inhalation; D002648:Child; D002675:Child, Preschool; D004432:Ear, Middle / Q000502:physiology* / Q000503:physiopathology; D006221:Halothane; D006801:Humans; D007385:Intermittent Positive-Pressure Ventilation; D009609:Nitrous Oxide; D010033:Otitis Media / Q000503:physiopathology*; D010034:Otitis Media with Effusion / Q000503:physiopathology*
chemical_list: D009609:Nitrous Oxide; D006221:Halothane