title: Occupational asthma and rhinitis caused by ash (Fraxinus excelsior) wood dust.
abstract: An 18-year-old man who worked in a furniture factory reported rhinitis and asthma when he was exposed to ash wood dust. Monitoring of the patient's peak expiratory flow rate (PEFR) when off work and at work showed increased variations of PEFR at work. Basal PC20 methacholine was 1.41 mg/ml. A bronchial provocation test (BPT) with a 1:1000 w/v ash wood dust extract induced a dual asthmatic response with a 7.5-fold increase of nonspecific bronchial responsiveness. Intradermal testing with ash wood extract elicited a positive immediate response. IgE antibodies against ash wood were found in the patient's serum with a RAST value of 0.57 PRU/ ml. Similar skin tests, BPT, and RAST with ash wood dust performed in control patients were all negative. All the studies performed suggest that our patient had occupational rhinitis and asthma caused by exposure to ash wood dust in which a type I immunologic mechanism was implicated.
authors.affiliation: Sección de Alergia, Hospital Virgen del Valle, Toledo, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Fernández-Rivas
authors.forename: C
authors.initials: C
authors.lastname: Pérez-Carral
authors.forename: C J
authors.initials: CJ
authors.lastname: Senent
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000209:etiology*; D001985:Bronchial Provocation Tests; D004391:Dust / Q000009:adverse effects* / Q000032:analysis; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000209:etiology*; D010366:Peak Expiratory Flow Rate; D012220:Rhinitis / Q000209:etiology*; D014197:Trees / Q000737:chemistry* / Q000276:immunology*; D014934:Wood
chemical_list: D004391:Dust