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Specific nasal provocation test with powder allergen

F A Salzano1

  • 1ENT Department, University Federico II, Naples, Italy.

Allergy
|January 1, 1997
PubMed
Summary
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A large trial found specific nasal provocation tests (sNPT) are highly sensitive for diagnosing nasal allergies and identifying key allergens. Intranasal immunotherapy significantly improved symptoms and immune markers in patients with allergic rhinitis.

Area of Science:

  • Allergy and Immunology
  • Otorhinolaryngology

Background:

  • Nasal hyperreactivity affects a significant portion of the population, with allergen sensitization varying regionally within Italy.
  • Accurate diagnosis of specific allergens is crucial for effective treatment of allergic rhinitis.

Purpose of the Study:

  • To evaluate the efficacy of specific nasal provocation tests (sNPT) in diagnosing nasal allergies and identifying primary allergens.
  • To assess the effectiveness of specific intranasal immunotherapy in patients with allergic rhinitis.

Main Methods:

  • A large-scale trial involving 656 patients across 51 Italian centers.
  • Comparison of sNPT with in vivo (prick test) and in vitro (RAST) diagnostic methods.
  • Double-blind, placebo-controlled trial of 1-year specific intranasal immunotherapy in 107 patients.

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Main Results:

  • sNPT demonstrated higher sensitivity than other diagnostic methods for identifying specific allergens and the main causative allergen.
  • Intranasal immunotherapy led to significant improvements: reduced nasal resistance (74.1%), normalized mucociliary transport (81%), increased reactivity threshold (74.1%), and improved local IgA/IgG levels.
  • No significant improvements were observed in the placebo group.

Conclusions:

  • Specific nasal provocation testing is a highly sensitive and fundamental tool for diagnosing nasal allergies and guiding immunotherapy.
  • Specific intranasal immunotherapy is an effective treatment for allergic rhinitis, improving nasal obstruction, rhinorrhea, and local immune responses.