Occupational Lung Disease Management

Introduction to Management

• No prophylactic medication or treatment is available to prevent progression once exposure has occurred, as stated by the American Thoracic Society 1

Symptomatic Treatment

• Symptomatic treatment includes bronchodilators for airflow limitation, oxygen therapy for hypoxemia, pulmonary rehabilitation, and vaccination against influenza and pneumococcus, which may improve functional capacity and quality of life, as recommended by the American College of Chest Physicians and American Journal of Respiratory and Critical Care Medicine 2, 3, 1

Duty to Inform and Report

• The American Thoracic Society recommends informing patients of work-related disease, reporting the disease to appropriate authorities, and informing patients about legal/compensation options 1

Risk Assessment and Management

• Patients should be considered at risk of progressive lung disease regardless of initial impairment, and removed from further asbestos exposure when possible, as recommended by the American Thoracic Society 1
• Managing concurrent COPD or asthma can reduce morbidity, and treatment of cor pulmonale, secondary polycythemia, and respiratory insufficiency should be considered if present, as stated by the American Thoracic Society 1
• A detailed work exposure history, including duration of exposure, latency period, intensity of exposure, and specific materials worked with, should be obtained to aid in the diagnosis of occupational respiratory disease, as recommended by the American Thoracic Society 2

Surveillance

• Monitoring for development of malignancies, especially mesothelioma and lung cancer, is essential, and screening for colorectal cancer should be considered in those over 50 years, as recommended by the American Thoracic Society 1
• High-Resolution Computed Tomography (HRCT) is superior to conventional radiography for detecting and characterizing parenchymal changes, especially in early disease, and can identify specific patterns for different types of pneumoconiosis, as recommended by the American Thoracic Society and American College of Radiology 4

Diagnosis

• A comprehensive evaluation including significant asbestos exposure history, characteristic radiological findings, pulmonary function tests, and in indeterminate cases, lung biopsy with asbestos body quantification is fundamental to exclude other causes of pulmonary fibrosis in asbestosis, according to the American Thoracic Society 1
• The International Labour Organization (ILO) classification system is used for radiological classification of neumoconiosis, with categories for the profusion of small opacities, type of opacities, extent of affected areas, large opacities, and pleural anomalies, as supported by the American College of Radiology 5, 6

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• A restrictive pattern characterized by reduced lung volumes (especially FVC and total lung capacity), decreased diffusion capacity, and arterial hypoxemia is typical of asbestosis, according to the American College of Chest Physicians 1
• Lung biopsy is crucial for differentiating asbestosis from other forms of pulmonary fibrosis, especially in cases with a history of intense smoking, as recommended by the American College of Chest Physicians 1

Prevention and Control

• Prevention of exposure remains the most important intervention for both conditions, and workplace dust control measures should be implemented and enforced, as recommended by the American Thoracic Society and Occupational Safety and Health Administration 7, 1
• Cessation of exposure to dust is the most important intervention, although it does not stop the progression of the disease once it is established, as supported by the American Thoracic Society and Occupational Safety and Health Administration 7, 1
• Mixed dust pneumoconiosis is associated with an increased risk of lung cancer, particularly with exposure to asbestos and silica, as reported by the American College of Chest Physicians and Occupational Safety and Health Administration 8, 1
• The prevention of mixed dust pneumoconiosis is the most important strategy to reduce morbidity and mortality associated with this occupational disease, with the American College of Chest Physicians recommending prevention of exposure to inorganic dusts as the primary prevention strategy 7, 1