Key Concepts
Introduction
Chronic obstructive pulmonary disease (COPD) is a preventable and treatable disease characterized by persistent, usually progressive airflow limitation that is not fully reversible. It is the third leading cause of death globally and a high-frequency NCLEX-RN topic. COPD encompasses two clinical phenotypes that often overlap: - Emphysema: destruction of alveolar walls → loss of elastic recoil → air trapping → hyperinflation. Classic presentation: thin, barrel-chested patient with pursed-lip breathing, minimal cough. - Chronic bronchitis: inflammation and mucus hypersecretion in bronchi for ≥ 3 months/year for ≥ 2 consecutive years. Classic: overweight, chronic productive cough, cyanosis. The most important modifiable risk factor is cigarette smoking (responsible for ~85% of cases). Other causes: occupational dust/chemical exposure, alpha-1 antitrypsin deficiency (hereditary COPD in young non-smokers), biomass fuel smoke. For NCLEX-RN: prioritize recognizing exacerbations, safe oxygen administration, and discharge teaching. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan:...