Acoustic rhinometry in nasal allergen challenge study: which dimensional measures are meaningful?

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
D Y WangY H Chan

Abstract

Acoustic rhinometry (AR) is commonly used as a quantitative assessment of nasal response to nasal allergen challenge (NAC). However, sources of error and physical limitations of various AR area-distance measurements have not been adequately evaluated. To investigate the clinical value of AR measurements, and the relationship between subjective sensation and objective AR measurements in the NAC study. Nasal challenge using increasing concentrations of crude Blomia tropicalis (Bt) extracts (0.6, 6, and 60 microg/mL) was performed in 15 adult patients (eight males and seven females) with ongoing persistent allergic rhinitis. Subjective symptom scores of nasal obstruction were recorded together with the objective AR measurements of the minimum cross-sectional area (MCA), distance to MCA and cross-sectional area (CSA) at 3.3, 4.0 and 6.4 cm from the nostril, during the 7 h after the last challenge. The dose-response increase in nasal obstruction score was significantly (P<0.001 for all) associated with decreases in mean MCA (r=0.75), mean CSA3.3 (r=0.54), mean CSA4.0 (r=0.53) and mean CSA6.4 (r=0.20). The mean MCA (+/-SD) for each subjective symptom score 0, 1, 2 and 3 was found to be 0.73 (+/-0.22) cm2, 0.63 (+/-0.29) cm2, 0.33 (+/...Continue Reading

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