title: Prevalence of occupational asthma and immunologic sensitization to guar gum among employees at a carpet-manufacturing plant.
abstract: Guar gum is a high-molecular-weight agent that can cause occupational rhinitis and asthma. We surveyed the employees at a carpet-manufacturing plant in which guar gum is used to adhere the dye to the fiber; 162/177 of the employees (92%) participated in the first part of the survey that included a questionnaire and skin prick tests with common allergens and guar gum (1 mg/ml). IgE and IgG antibodies to guar gum were also measured in those subjects (133/162 or 82%) who agreed to blood tests. Thirty-seven subjects (23%) had a history suggestive of occupational asthma and 59 (36%), of occupational rhinitis. Eight subjects (5%) demonstrated immediate skin reactivity to guar gum. Eleven subjects (8.3%) had serum IgE antibodies to guar gum. All subjects, except one subject who had a history suggestive of occupational asthma (n = 37) or positive skin tests (n = 4), participated in the second part of the study. A methacholine-inhalation test was performed during a workshift or in the 3 to 4 hours after the workshift. Five subjects had a concentration of methacholine causing a 20% fall in FEV1 of less than 16 mg/ml (significant bronchial hyperresponsiveness) and positive skin reactions to guar gum. Four of these subjects underwent specific inhalation challenges. The remaining subject had a history of severe bronchospastic reaction on exposure to guar gum, and his FEV1 of 1.6 L made specific challenges impossible. Two subjects had typical isolated immediate reactions.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Chest Medicine, Hôpital du Sacré-Coeur, Montreal, Canada.
authors.forename: J L
authors.initials: JL
authors.lastname: Malo
authors.forename: A
authors.initials: A
authors.lastname: Cartier
authors.forename: J
authors.initials: J
authors.lastname: L'Archevêque
authors.forename: H
authors.initials: H
authors.lastname: Ghezzo
authors.forename: F
authors.initials: F
authors.lastname: Soucy
authors.forename: J
authors.initials: J
authors.lastname: Somers
authors.forename: J
authors.initials: J
authors.lastname: Dolovich
mesh_terms: D001249:Asthma / Q000139:chemically induced / Q000175:diagnosis / Q000453:epidemiology*; D001985:Bronchial Provocation Tests; D002170:Canada / Q000453:epidemiology; D005430:Floors and Floorcoverings; D005685:Galactans / Q000009:adverse effects* / Q000276:immunology; D006801:Humans; D007114:Immunization; D007073:Immunoglobulin E / Q000032:analysis; D008351:Mannans / Q000009:adverse effects* / Q000276:immunology; D009784:Occupational Diseases / Q000139:chemically induced / Q000175:diagnosis / Q000453:epidemiology*; D053149:Plant Gums; D015995:Prevalence; D012882:Skin Tests; D011795:Surveys and Questionnaires
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D007073:Immunoglobulin E; C007894:guar gum