NCLEX Review Guide: Occupational Lung Disease

Definition and Pathophysiology

• Occupational lung diseases are respiratory conditions caused by prolonged inhalation of harmful substances in the workplace, leading to chronic inflammation and progressive lung damage.
• Pathogenesis involves alveolar macrophage activation and inflammatory cascade resulting in fibrosis, scarring, and impaired gas exchange.

Silicosis

• Crystalline silica exposure from sandblasting, mining, or stone cutting causes progressive massive fibrosis and increased risk of lung cancer.
• Three forms: acute (high exposure), chronic (10-20 years), and accelerated (5-10 years) with varying severity and progression rates.

Asbestosis

• Asbestos fiber inhalation causes lower lobe fibrosis, pleural plaques, and significantly increases mesothelioma and lung cancer risk.
• Latency period of 20-40 years between exposure and symptom onset makes early detection challenging.

Coal Worker's Pneumoconiosis (Black Lung)

• Coal dust accumulation causes simple pneumoconiosis (small nodules) progressing to complicated pneumoconiosis (progressive massive fibrosis).
• Caplan syndrome occurs when rheumatoid arthritis coexists with pneumoconiosis, creating large pulmonary nodules.

Common Signs and Symptoms

• Progressive dyspnea starting with exertion and advancing to rest, accompanied by chronic dry cough and chest tightness.
• Late-stage manifestations include clubbing, cyanosis, cor pulmonale, and respiratory failure requiring mechanical ventilation.

Imaging and Pulmonary Function

• High-resolution CT (HRCT) is gold standard for detecting early fibrotic changes before chest X-ray abnormalities appear.
• Pulmonary function tests show restrictive pattern with decreased FVC, TLC, and DLCO indicating impaired gas exchange.

Primary Nursing Interventions

1. Remove from exposure source immediately to prevent further lung damage and disease progression.
2. Monitor respiratory status including oxygen saturation, respiratory rate, and use of accessory muscles during activities.
3. Administer bronchodilators and corticosteroids as prescribed to reduce inflammation and improve airway function.
4. Provide oxygen therapy to maintain SpO2 >90% and assess for signs of cor pulmonale development.