Background: Although there is a recognized association between upper and lower allergic airways disease, it is unknown how seasonal allergic rhinitis (SAR) therapy will effect sensitive markers of airway function in patients with no history of asthma.
Objective: To prospectively evaluate subjective and objective markers of treatment response in 26 patients with SAR who have been screened to exclude a diagnosis of asthma.
Methods: The patients' usual treatment, with antihistamine alone (n = 13) or in combination with intranasal corticosteroid (n = 13), was withheld for 1 week to achieve a baseline and then resumed. Measurements were made after baseline and after 2 and 4 weeks of treatment for nasal peak inspiratory flow rate (nPIFR); airways resistance (Raw) and specific conductance (sGaw); and nasal nitric oxide (NO). Patients reported their symptom (nasal, throat and eye) scores, daily activity scores, and ocular sodium cromoglycate usage over the preceding 24 hours.
Results: Compared with baseline, there were significant (P < .05) improvements with nPIFR, symptom scores and cromoglycate usage at 2 and 4 weeks of treatment. There was no significant suppression for NO at 2 or 4 weeks. There was a significant correlation between nPIFR and nasal symptoms (r = -0.52, P < .001). After 4 weeks of treatment there were significant (P < .05) improvements in sGaw (143.3% predicted) and Raw (91.6% predicted) compared with baseline (sGaw: 111.8%, Raw: 104.2% predicted).
Conclusion: Treatment of SAR improves upper and lower airway parameters but not NO. Nasal PIFR correlates significantly with nasal symptoms.