Measurement of the nasopharynx-maxillary sinus pressure difference as function test of the ostium of the maxillary sinus.
D006801:Humans; D008365:Manometry / Q000379:methods; D008443:Maxillary Sinus / Q000502:physiology*; D009305:Nasopharynx / Q000502:physiology*; D011312:Pressure; D012119:Respiration; D012129:Respiratory Function Tests