The reduction of rhinitis symptoms by nasal filters during natural exposure to ragweed and grass pollen
Article first published online: 23 FEB 2005
Volume 60, Issue 4, pages 529–532, April 2005
How to Cite
O'Meara, T. J., Sercombe, J. K., Morgan, G., Reddel, H. K., Xuan, W. and Tovey, E. R. (2005), The reduction of rhinitis symptoms by nasal filters during natural exposure to ragweed and grass pollen. Allergy, 60: 529–532. doi: 10.1111/j.1398-9995.2005.00741.x
- Issue published online: 23 FEB 2005
- Article first published online: 23 FEB 2005
- Accepted for publication 13 August 2004
- allergen avoidance;
- nose filter;
Background: Prototype nasal filters were developed to collect inhaled pollen. This study evaluated the efficacy of the filters for prevention of rhinitis symptoms during acute outdoor pollen exposure.
Methods: A randomized double-blind design was used. Subjects (n = 46) with a history of autumn exacerbation of rhinitis and positive skin test to ragweed, Bermuda and/or Bahia grass wore either active or placebo nasal filters for 2 h in autumn in a park containing these species. Major and Total Symptoms scores were recorded at 0, 30, 60, 90 and 120 min.
Results: Subjects wearing active nasal filters had significantly reduced scores, at all time-points compared with placebo group (all P < 0.05). Of 14 individual symptoms measured, seven were significantly reduced (number of sneezes, runny nose, itchy nose, sniffles, itchy throat; itchy eyes and watery eyes) and another three showed a trend towards lower severity. The nasal filters also enabled the resolution of existing symptoms. Maximal difference in symptoms was seen immediately after subjects had spent 20 min sitting beside a large patch of ragweed.
Conclusion: This is the first clinical trial of a nasal filter. The results suggest it has potential for enhancing rhinitis management during acute allergen exposure.