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Related Experiment Videos

Non-specific hyperreactivity before and after nasal specific immunotherapy.

F Filiaci1, G Zambetti, R Romeo

  • 1Department of Otorhinolaryngology, University La Sapienza, Rome, Italy.

Allergologia Et Immunopathologia
|April 27, 1999
PubMed
Summary
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Specific local immunotherapy (SLIT) effectively reduced allergic rhinitis symptoms. However, improvements in non-specific hyperreactivity and nasal resistance diminished within 12 months after discontinuing SLIT, indicating a limited duration of sustained benefits.

Area of Science:

  • Immunology
  • Otolaryngology
  • Allergy Research

Background:

  • Specific local immunotherapy (SLIT) is known to improve allergic rhinitis symptoms during and after treatment.
  • The long-term efficacy and duration of clinical and instrumental improvements after SLIT cessation remain unclear.

Purpose of the Study:

  • To assess changes in non-specific nasal reactivity in patients allergic to Dermatophagoides pteronissinus.
  • To evaluate these changes during three years of SLIT and up to 24 months post-treatment.

Main Methods:

  • Sixteen patients with D. pteronissinus allergy underwent SLIT via nasal spray.
  • Evaluations included skin tests, RAST, and nasal provocation tests (NPT) before, during, and up to 24 months after SLIT.
  • Symptom diaries and total nasal resistance (TNR) were monitored throughout the study.

Related Experiment Videos

Main Results:

  • SLIT initially reduced total nasal resistance (TNR) and non-specific hyperreactivity.
  • Symptomatic deterioration and increased TNR were observed in a significant proportion of patients starting 6 months after SLIT discontinuation.
  • By 12 months post-treatment, TNR values approached baseline levels, with symptom recurrence noted.

Conclusions:

  • SLIT effectively manages D. pteronissinus sensitivity symptoms and reduces non-specific hyperreactivity during treatment.
  • The beneficial effects on non-specific hyperreactivity and nasal resistance were not sustained beyond 12 months after SLIT cessation.
  • SLIT's clinical results may not extend beyond one year post-treatment discontinuation.