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Olfactory threshold after nasal allergen challenge

I Hinriksdóttir1, C Murphy, M Bende

  • 1Department of Otorhinolaryngology, Central Hospital, Skövde, Sweden.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|January 1, 1997
PubMed
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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.

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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.