title: Nasal polyps: effects of seasonal allergen exposure.
abstract: Nasal polyps are characterized by chronic eosinophilic inflammation and often coexist with rhinitis and asthma. Many patients with polyps have no detectable allergy, and it is considered that allergy, at least in many cases, is not relevant to polyp to pathogenesis. To explore the association of nasal polyps with allergy, 16 patients with polyps and ragweed allergy (PRW +) and 16 patients with polyps who were not allergic to ragweed (PRW-) were compared with patients without polyps, 16 who were allergic to ragweed (NPRW +) and 16 who were not allergic to ragweed (NPRW-), before and during the ragweed season. The level of ragweed allergy was comparable in the PRW+ and NPRW+ populations as determined by ragweed skin test wheal diameter, ragweed IgE RAST percent binding, and total serum IgE. Symptom scores before the ragweed season recorded on visual analog scales for the symptoms of blockage, sneezing, decreased smell, itch, postnatal drip, and runny nose were high in patients in the PRW+ and PRW- groups and did not change during ragweed season. Mean symptom scores were low in the NPRW+ group before ragweed season and increased during the season to levels similar to those of patients in the PRW+ and PRW- groups. Preseason nasal lavage albumin concentration was higher in subjects with polyps than those without polyps (58.5, 98) versus (13.6, 15 micrograms/ml) (p = 0.02) and did not change significantly in any group with seasonal exposure. Data are presented as mean, 1 SD; comparisons are made with unpaired t tests.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
authors.forename: P K
authors.initials: PK
authors.lastname: Keith
authors.forename: M
authors.initials: M
authors.lastname: Conway
authors.forename: S
authors.initials: S
authors.lastname: Evans
authors.forename: D A
authors.initials: DA
authors.lastname: Wong
authors.forename: G
authors.initials: G
authors.lastname: Jordana
authors.forename: D
authors.initials: D
authors.lastname: Pengelly
authors.forename: J
authors.initials: J
authors.lastname: Dolovich
mesh_terms: D000328:Adult; D000368:Aged; D000403:Airway Resistance; D000485:Allergens / Q000276:immunology*; D001798:Blood Proteins / Q000378:metabolism; D047091:Eosinophil Granule Proteins; D004804:Eosinophils / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009296:Nasal Cavity / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D009298:Nasal Polyps / Q000150:complications / Q000276:immunology* / Q000473:pathology; D006255:Rhinitis, Allergic, Seasonal / Q000150:complications / Q000473:pathology / Q000503:physiopathology; D012260:Ribonucleases; D012621:Seasons; D007507:Therapeutic Irrigation
chemical_list: D000485:Allergens; D001798:Blood Proteins; D047091:Eosinophil Granule Proteins; D012260:Ribonucleases