title: Studies of the gas exchange and pressure in the maxillary sinuses in normal and infected humans.
abstract: The total gas pressure in experimentally occluded maxillary sinus was continuously recorded during 90 minutes on 7 healthy human subjects. PO2 and PCO2 were measured before and after the total pressure recording. In 3 cases the volume changes in the sinus were measured. The total gas pressure after an initial increase to about 35 mm H2O decreased to a steady state of about 70 mm H2O below atmospheric pressure. The volume changes in sinus showed a corresponding alteration. The gas measurements showed a decrease of PO2 of 25 mm Hg and a rise of PCO2 of 21 mm Hg. In 3 patients with acute purulent sinusitis there was seen a pressure of about 10 cm H2O above the atmospheric pressure.
mesh_terms: D000328:Adult; D002245:Carbon Dioxide / Q000097:blood*; D006801:Humans; D008443:Maxillary Sinus / Q000502:physiology* / Q000503:physiopathology; D010100:Oxygen / Q000097:blood*; D011312:Pressure; D012852:Sinusitis / Q000503:physiopathology*
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen