Methacholine bronchial responsiveness and variations in lung function among workers exposed to flour

Area of Science:

• Occupational health
• Pulmonary medicine
• Respiratory toxicology

Background:

• Occupational exposure to airborne substances, such as wheat flour dust, can impact respiratory health.
• Assessing bronchial responsiveness and lung function variability is crucial for understanding occupational respiratory diseases.

Purpose of the Study:

• To compare methacholine bronchial responsiveness and pulmonary function variations in workers exposed to wheat flour versus a control group.
• To investigate the combined effects of occupational flour exposure and smoking on respiratory parameters.

Main Methods:

• 140 male workers exposed to flour and 77 controls completed questionnaires.
• Bronchial responsiveness measured by methacholine dose-response slope (FEV1 decrements).
• Pulmonary function (FEV1, PEF) variability assessed using electronic spirometry and variation coefficients over 15 days.

Main Results:

• Rhinitis was significantly more prevalent in the flour-exposed group (30.7% vs. 11.7%).
• No significant differences in mean FEV1 or PEF between groups.
• Higher methacholine responsiveness and lung function variability observed in exposed workers and smokers, particularly significant in exposed smokers.

Conclusions:

• Occupational exposure to flour and smoking independently increase bronchial responsiveness.
• Methacholine bronchial responsiveness and lung function variability capture different aspects of airway behavior.
• Findings highlight the importance of controlling occupational exposures and smoking for respiratory health.