Chronic Obstructive Pulmonary Disease
Key Points
- COPD is a progressive inflammatory airflow limitation caused by chronic bronchitis, emphysema, or both.
- Chronic hypoxemia and hypercapnia drive symptom burden and exacerbation risk.
- Exacerbations are the primary cause of COPD-related hospitalization and mortality acceleration.
- Nursing priorities focus on oxygenation monitoring, bronchodilator therapy, and self-management education.
Pathophysiology
COPD results from prolonged exposure to irritants (primarily cigarette smoke) causing airway inflammation, mucus hypersecretion (chronic bronchitis), and alveolar destruction with loss of elastic recoil (emphysema). Airflow limitation is largely irreversible and progressive.
Chronic hypoxemia stimulates erythropoiesis (secondary polycythemia) and pulmonary vasoconstriction (cor pulmonale in severe disease). Hypercapnia develops when respiratory muscle fatigue limits compensation.
Classification
- Chronic bronchitis: Productive cough ≥3 months/year for 2 consecutive years; “blue bloater” pattern.
- Emphysema: Alveolar destruction and air trapping; “pink puffer” pattern with barrel chest.
- GOLD classification: Severity graded by FEV₁ % predicted (I–IV) and symptom burden.
- Risk-factor profile: Modifiable risks include smoking, secondhand smoke, occupational dust/fume exposure, and indoor biomass smoke. Nonmodifiable risks include age over 40 years, childhood respiratory infections, history of asthma, prematurity-associated underdeveloped lungs, and alpha-1 antitrypsin deficiency.
Nursing Assessment
NCLEX Focus
Monitor O₂ saturation carefully in COPD — high-flow oxygen can suppress hypoxic drive in severe disease.
- Assess dyspnea, cough, sputum production, and activity tolerance at baseline and during exacerbations.
- Auscultate for prolonged expiration, wheezing, and diminished breath sounds.
- Monitor oxygen saturation — target 88–92% for hypercapnic COPD to preserve hypoxic drive.
- Assess for signs of cor pulmonale: peripheral edema, JVD, hepatomegaly.
- Assess exposure history (occupational particulates, indoor coal/wood smoke, secondhand smoke) and nonmodifiable COPD risk cues (childhood infections, prematurity, alpha-1 antitrypsin deficiency history).
- Screen for anxiety and depression, which are common comorbidities affecting adherence.
Nursing Interventions
- Administer bronchodilators (short-acting beta-agonists, anticholinergics) and corticosteroids as ordered.
- Position in high Fowler’s or tripod position to maximize respiratory effort.
- Teach pursed-lip breathing and diaphragmatic breathing to reduce air trapping.
- Distinguish controller versus rescue inhalers: use inhaled corticosteroids (for example fluticasone) daily with post-dose mouth rinse, and use albuterol for rapid dyspnea relief.
- Educate on smoking cessation — the only intervention proven to slow disease progression.
- Segment ADLs and position for breathing comfort to reduce dyspnea burden during routine activity.
- Reinforce prescribed supplemental-oxygen adherence when ordered.
- Coordinate pulmonary rehabilitation referral for eligible patients.
- Plan energy conservation strategies for activities of daily living.
Oxygen Administration
In chronic hypercapnic COPD, excessive oxygen (>92%) can suppress the hypoxic respiratory drive. Titrate O₂ carefully to target 88–92%.
Pharmacology
| Drug Class | Examples | Key Considerations |
|---|---|---|
| Short-acting bronchodilators | Albuterol (SABA), ipratropium (SAMA) | Rescue use; teach inhaler technique |
| Long-acting bronchodilators | Salmeterol (LABA), tiotropium (LAMA) | Maintenance; not for acute relief |
| corticosteroids | Prednisone, budesonide/formoterol | Exacerbations: oral systemic; maintenance: inhaled |
| Phosphodiesterase-4 inhibitors | Roflumilast | Severe COPD with chronic bronchitis |
Clinical Judgment Application
Clinical Scenario
A COPD patient on 2L nasal cannula develops worsening dyspnea. SpO₂ is 86%. The nurse increases O₂ to 6L.
- Recognize Cues: O₂ saturation low, but rapid high-flow increase risks suppressing hypoxic drive.
- Analyze Cues: Patient has chronic hypercapnia; target 88–92%, not normoxia.
- Prioritize Hypotheses: Risk of respiratory depression from excessive O₂ in hypercapnic patient.
- Generate Solutions: Titrate O₂ to 88–92%, reassess frequently, prepare for escalation if needed.
- Take Action: Adjust to lowest O₂ flow achieving target SpO₂; notify provider; monitor ABGs.
- Evaluate Outcomes: SpO₂ maintained in safe range without worsening respiratory depression.
Related Concepts
- asthma-action-plan-and-exacerbation-management - Obstructive lung disease comparison and differentiation.
- respiratory-system - Normal airway physiology and defense mechanisms.
- oxygen-therapy - Oxygen delivery systems and monitoring in respiratory disease.
- evidence-based-respiratory-care - Bronchial hygiene and airway clearance techniques in COPD.
Self-Check
- Why is high-flow oxygen potentially dangerous for hypercapnic COPD patients?
- What distinguishes chronic bronchitis from emphysema clinically?
- Which intervention has the strongest evidence for slowing COPD progression?