Introduction: Acoustic rhinometry (RA) is evaluates area and volume of regions above the nose. The beginning of rhinogram presents two notches: the second is the cross-sectional area of the nasal valve (ASM2). The purpose of this study is to evaluate the nasal valve, which limits the area for greater resistance to nasal airflow, about half the total resistance in patients with and without nasal respiratory complaint. Methods: The study included 385 patients in this study, 93 with functional complaint. We use the apparatus of the acoustic rhinometry Rhinometrics, the Rhino Scan 2.5. The graphics were stored and ASM2 (examination with vasoconstrictor) were analyzed to determine the parameters of rhinometry in patients with and without functional complaint. Results: 224 patients with ASM2> 0.40 cm2 without complaint functional, 68 patients with ASM2 between 0.25 and 0.40 cm2 without complaint functional and 93 patients with functional complaint, being 28 between 0.25 and 0.40 cm2 and 65 <0.25 cm2. Discussion: The findings show that no patient with ASM2 greater than 0.40 cm2 have functional complaint, which qualify as the internal nasal valve functioning, and no patient with ASM2 less than 0.25 cm2 can breathe properly, which leads to a condition called insufficient valve. Some patients with ASM2 between 0.25 and 0.40 cm2 have complained functional, while others do not, therefore, the nasal valve with a figure of cross-sectional area are classified as borderline. Conclusion: The Rhinometry is the only method that assesses the failure of internal nasal valve so objective.
Keywords: Rhinometry, Acoustic/methods. Nasal cavity. Nose.