title: Effect of H1 and H2 antagonists on nasal symptoms and mediator release in atopic patients after nasal allergen challenge during the pollen season.
abstract: During the pollen season, quantitative determination of the chemical mediators and eosinophil count was performed in 16 patients with hay fever after nasal allergen challenge (NAC). The aim of this study was objectively to assess the effect of H1 and of a combination of H1 and H2 antagonists on nasal symptoms, mediator release, and eosinophil count during an allergic reaction. NAC was performed at baseline (V1), 2 weeks after treatment with cetirizine 10 mg/day (V2), and after a combined therapy with cetirizine 10 mg and cimetidine 800 mg a day during the following week (V3). Results showed a significant (p < 0.05 or p < 0.01) relief of nasal symptoms such as: itching, sneezing, rhinorrhea and congestion, and of objective parameter such as: reduction of the number of sneezes after NAC at V2 and V3. Neither H1 antagonist nor a combination of H1 and H2 antagonists showed any effect on eosinophilia and ECP concentration caused by natural allergen exposure, nor on histamine and tryptase release immediately after NAC. When a combination of H1 and H2 antagonists was administered significant reduction of the nasal airway resistance and increase of the nasal air flow were demonstrated.
authors.affiliation: Department of Otorhinolaryngology, University Hospital, Brussels, Belgium.
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Clement
authors.forename: J
authors.initials: J
authors.lastname: Smitz
mesh_terms: D000328:Adult; D000403:Airway Resistance / Q000187:drug effects; D017332:Cetirizine / Q000494:pharmacology / Q000627:therapeutic use*; D004804:Eosinophils; D005260:Female; D006634:Histamine H1 Antagonists / Q000627:therapeutic use*; D006635:Histamine H2 Antagonists / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy*; D016896:Treatment Outcome
chemical_list: D006634:Histamine H1 Antagonists; D006635:Histamine H2 Antagonists; D017332:Cetirizine