Small airways dysfunction among non-smoking shipyard arc welders.

Area of Science:

• Occupational Medicine
• Pulmonary Physiology
• Environmental Health

Background:

• Welding involves exposure to fumes and gases that may affect respiratory health.
• Small airways dysfunction is an early indicator of lung disease.
• Previous studies have suggested links between occupational exposures and respiratory issues.

Purpose of the Study:

• To investigate small airways dysfunction in never-smoking welders.
• To compare lung function and airway reactivity in welders versus a non-exposed reference group.
• To assess the impact of welding exposure on lung volumes and airway responsiveness.

Main Methods:

• Comparison of spirometry, nitrogen washout, and methacholine provocation tests between 14 welders and 14 non-exposed referents.
• Measurement of forced expiratory volume in one second (FEV1) and volume of trapped gas (VTG).
• Assessment of changes in FEV1 and VTG following methacholine challenge and salbutamol administration.

Main Results:

• Welders exhibited significantly higher VTG and VTG/Total Lung Capacity (TLC) compared to referents before provocation.
• Welders showed a greater decrease in FEV1 (6% vs 2%) after methacholine inhalation.
• Increased VTG and VTG/TLC persisted in welders post-methacholine and post-salbutamol, indicating persistent small airways changes.

Conclusions:

• Shipyard welders demonstrate evidence of small airways disease.
• Occupational exposure in welding is associated with impaired lung function and increased airway reactivity.
• These findings highlight the need for respiratory health monitoring in welding populations.