title: Methods for measurement/evaluation of the maxillary and frontal sinus ostial function.
abstract: Several test methods for evaluation of the maxillary and frontal sinus ostial function have been described. The test methods can be divided up as follows. Invasive methods: Measurements during spontaneous breathing and measurements during artificial pressure application. Non-invasive methods: Methods with pure stable xenon and xenon133. The most physiological invasive method is measurement during spontaneous nasal breathing and simultaneous recording of the pressure difference over the ostium and air flow through the ostium. Hereby, the ostial resistance can be calculated and the equivalent ostial diameter be estimated. Ostial equivalent diameters up to 2.5 mm can be calculated. By measurement of the pressure difference between the sinus and nose during application of a constant air flow of 1 liter per minute into the sinus, the pressure increase corresponds to the equivalent ostial diameter. Ostial equivalent diameters up to 4.7 mm can be estimated. Non-invasive methods with stable xenon and xenon133 permit an overall evaluation of the ventilation of the paranasal sinuses. However, these methods will only give indirect information about the ostial condition. The non-invasive methods have to be compared with the invasive methods in order to find out if the wash out curves correspond to the equivalent ostial diameter.
authors.affiliation: Department of Otolaryngology, University of Lund, Malmö General Hospital, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Jannert
mesh_terms: D000403:Airway Resistance / Q000502:physiology*; D005626:Frontal Sinus / Q000502:physiology*; D006801:Humans; D008443:Maxillary Sinus / Q000502:physiology*; D012129:Respiratory Function Tests / Q000379:methods; D014980:Xenon Radioisotopes
chemical_list: D014980:Xenon Radioisotopes