Diagnostic criteria of nonspecific hyperreactivity using cold dry air provocation with acoustic rhinometry.

OBJECTIVE

The authors aimed to (1) compare symptom changes in patients with or without nonspecific hyperreactivity, (2) compare changes in total nasal volume (TNV) and minimal cross-sectional area (MCA) using acoustic rhinometry after cold dry air (CDA) challenge, and (3) set the diagnostic criteria using receiver operating characteristic (ROC) curve analysis.

STUDY

DESIGN

Prospective pilot.

SETTING

Academic tertiary rhinologic practice.

SUBJECTS AND

METHODS

CDA provocation was performed on 45 patients with self-reported hypersensitivity to cold dry air (group A) and to 53 patients without such hypersensitivity (group B). Symptoms (as measured by visual analog scale [VAS]), TNV, and MCA were checked before and after provocation.

RESULTS

The changes in nasal obstruction (1.8 ± 2.1 vs 0.0 ± 2.3) and rhinorrhea (0.8 ± 2.1 vs -0.5 ± 2.3) were significantly greater in group A (P < .01 in each case). There were no significant differences between groups in VAS scores for sneezing and itching. From the ROC curve, the authors set the diagnostic criterion as "TNSS (total nasal symptom score) change larger than 1.5," and its sensitivity and specificity were 75.6% and 86.8%, respectively. The criteria "TNV decrease larger than 19.5%" and "MCA change larger than 15.0%" had higher sensitivity and specificity (TNV: 84.4% sensitivity and 77.4% specificity; MCA: 93.3% sensitivity and 77.4% specificity).

CONCLUSIONS

The authors were able to propose diagnostic criteria of nonspecific hyperreactivity using a CDA provocation test with acoustic rhinometry. These results are also helpful for understanding the pathophysiologic mechanisms of nonspecific hyperreactivity.