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Oilseed rape and bronchial reactivity

A Soutar1, C Harker, A Seaton

  • 1Department of Environmental and Occupational Medicine, University Medical School, Foresterhill, Aberdeen.

Occupational and Environmental Medicine
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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People experiencing symptoms during oilseed rape season rarely have allergies to the plant. However, increased bronchial reactivity was observed, possibly due to irritants rather than direct allergy.

Area of Science:

  • Environmental Health
  • Respiratory Medicine
  • Allergology

Background:

  • Symptoms during oilseed rape flowering season prompt investigation into potential allergies and respiratory effects.
  • Previous studies suggest a link between agricultural exposures and respiratory symptoms.

Purpose of the Study:

  • To investigate atopy and changes in symptoms, peak flow rate, and bronchial reactivity in individuals reporting symptoms during oilseed rape flowering.

Main Methods:

  • Studied 37 symptomatic individuals and 24 controls, assessing atopy via skin prick tests, total immunoglobulin E (IgE), and radioallergosorbent test (RAST).
  • Measured bronchial reactivity (PC20) using histamine challenge before and during the oilseed rape season.
  • Monitored daily symptoms and peak flow rates throughout the season.

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Main Results:

  • Only 2 of 23 tested individuals showed oilseed rape allergy; 10 were atopic.
  • Symptomatic individuals reported increased eye, nasal, and headache symptoms during the season.
  • A significant seasonal decrease in bronchial reactivity (PC20) was observed in symptomatic individuals compared to controls.

Conclusions:

  • Oilseed rape allergy is uncommon in symptomatic individuals; atopy is present in less than half.
  • Increased bronchial reactivity during the season suggests potential non-specific irritant effects or other allergens, not solely oilseed rape allergy.
  • The exact cause of increased bronchial reactivity remains unclear, with possibilities including crop chemicals, ozone, or other environmental factors.