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Olfactory threshold after nasal allergen challenge
I Hinriksdóttir1, C Murphy, M Bende
1Department of Otorhinolaryngology, Central Hospital, Skövde, Sweden.
Summary
Allergic rhinitis to birch pollen impairs smell sensitivity. This study found that birch pollen allergy significantly reduced olfactory threshold in patients after allergen challenge.
Area of Science:
- Immunology
- Otolaryngology
- Sensory Science
Background:
- Allergic rhinitis is a common condition affecting nasal passages.
- Birch pollen is a significant allergen for many individuals.
- Olfactory function can be impacted by upper airway inflammation.
Purpose of the Study:
- To investigate the effect of birch pollen allergen challenge on olfactory threshold in patients with allergic rhinitis.
- To determine the relationship between changes in olfactory sensitivity and nasal symptoms.
Main Methods:
- Olfactory threshold was measured in 20 patients with allergic rhinitis before and after topical birch pollen allergen challenge.
- Nasal secretions, nasal obstruction (subjective and objective), and olfactory detection sensitivity were assessed.
Main Results:
- A statistically significant impairment in olfactory detection sensitivity was observed after birch pollen provocation.
- The elevation in olfactory threshold correlated with increased nasal secretions.
- No significant correlation was found between olfactory threshold changes and registered nasal obstruction.
Conclusions:
- A pronounced allergic reaction to birch pollen in patients with allergic rhinitis is associated with an elevated olfactory threshold.
- Nasal secretions play a role in the olfactory dysfunction observed during allergic reactions.
- Further research can explore targeted interventions for olfactory deficits in allergic rhinitis.