The role of acoustic rhinometry in nasal provocation testing.

Geometric changes of the nasal airway in response to allergen challenge were measured by acoustic rhinometry (AR) and the sensitivity of the method was compared with that of rhinomanometry. Ten asymptomatic patients who suffered from ragweed allergic rhinitis were challenged out of season. The use of a custom-made noninvasive nasal adapter was an important feature of the measurement technique. A dose-dependent decrease in nasal cross-sectional area was found at and posterior to the entrance to the nasal valve. Both rhinometric and rhinomanometric methods were equivalent in sensing the changes in nasal patency due to allergen exposure (p = 0.73). Acoustic rhinometry, however, was simpler, more quickly performed and more comfortable for the subjects than was rhinomanometry by body plethysmography. AR is an alternative objective method for measurement of nasal mucosal responses, as in allergen challenge.