title: Gas tension and pH in middle ear effusion.
abstract: The composition of gases and the gas tension in middle ear effusion in patients with serous otitis media have been investigated. By using a specially designed micro-method, very small amounts of middle ear fluid could be analyzed. The effusion was obtained by puncturing the air cells of the mastoid process. The average value of P-O2 was 41 mm Hg; Pco2 was 58 mm Hg, pH 7.24. The possible mechanism for the impaired perfusion of the mucous membranes is discussed as well as some clinical consequences.
mesh_terms: D001274:Atmospheric Pressure; D001707:Biopsy, Needle; D002245:Carbon Dioxide / Q000032:analysis*; D004058:Diffusion; D005122:Exudates and Transudates / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008416:Mastoid / Q000473:pathology; D008839:Microelectrodes; D010033:Otitis Media / Q000473:pathology; D010100:Oxygen / Q000032:analysis*; D014065:Tonometry, Ocular
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen