side by side comparison

Asthma vs COPD: Reversible vs Irreversible Airway Disease

Both diseases wheeze, both use inhalers, and both show up as "difficulty breathing" on your NCLEX vignette. But cranking O2 to 100% on a COPD patient can knock out their respiratory drive, and telling an asthma patient their disease is progressive and irreversible is flat wrong. The distinction changes your O2 settings, your teaching, and your medication priorities.

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Comparison

Side-by-side2 compared
Dimension
Asthma
COPD
Pathophysiology & risk
  • ★Reversible airway inflammation
  • Onset <30
  • triggers allergens/exercise/cold
  • ★Irreversible, progressive airflow limit
  • Onset >40
  • smoking ≥20 pack-years
Signs & symptoms
  • Diffuse expiratory wheezing
  • minimal sputum
  • Silent chest = severe, emergent
  • Diminished sounds, rhonchi
  • productive cough
  • Barrel chest from air trapping
Diagnostics & labs
  • FEV₁ improves ≥12% AND ≥200 mL (reversible)
  • PFTs normalize between attacks
  • FEV₁/FVC <0.70 post-bronchodilator
  • Fixed obstruction
  • never normalizes
Nursing priorities
  • High-flow O₂ safe
  • target SpO₂ ≥ 95%
  • Treat acute bronchospasm fast
  • ★Low-flow O₂ 1–2 L/min
  • SpO₂ 88–92%
  • Avoid high O₂ — preserves hypoxic drive
Management
  • ICS = foundation of long-term control
  • SABA for rescue
  • prevents remodeling
  • LABA + LAMA mainstay
  • ICS added only for frequent flares
Patient teaching
  • Identify and avoid triggers
  • Daily controller vs rescue inhaler use
  • Smoking cessation is priority
  • Pursed-lip breathing
  • pulmonary rehab
Red flags — escalate
  • Silent chest, fatigue then respiratory failure
  • No relief from rescue inhaler
  • Rising CO₂, somnolence then CO₂ narcosis
  • Sputum change + fever = exacerbation
Complications
  • Status asthmaticus
  • Full control possible
  • normal lifespan
  • Cor pulmonale
  • respiratory failure
  • Progressive lung-function decline
Pathophysiology & risk

Asthma

  • ★Reversible airway inflammation
  • Onset <30
  • triggers allergens/exercise/cold

COPD

  • ★Irreversible, progressive airflow limit
  • Onset >40
  • smoking ≥20 pack-years
Signs & symptoms

Asthma

  • Diffuse expiratory wheezing
  • minimal sputum
  • Silent chest = severe, emergent

COPD

  • Diminished sounds, rhonchi
  • productive cough
  • Barrel chest from air trapping
Diagnostics & labs

Asthma

  • FEV₁ improves ≥12% AND ≥200 mL (reversible)
  • PFTs normalize between attacks

COPD

  • FEV₁/FVC <0.70 post-bronchodilator
  • Fixed obstruction
  • never normalizes
Nursing priorities

Asthma

  • High-flow O₂ safe
  • target SpO₂ ≥ 95%
  • Treat acute bronchospasm fast

COPD

  • ★Low-flow O₂ 1–2 L/min
  • SpO₂ 88–92%
  • Avoid high O₂ — preserves hypoxic drive
Management

Asthma

  • ICS = foundation of long-term control
  • SABA for rescue
  • prevents remodeling

COPD

  • LABA + LAMA mainstay
  • ICS added only for frequent flares
Patient teaching

Asthma

  • Identify and avoid triggers
  • Daily controller vs rescue inhaler use

COPD

  • Smoking cessation is priority
  • Pursed-lip breathing
  • pulmonary rehab
Red flags — escalate

Asthma

  • Silent chest, fatigue then respiratory failure
  • No relief from rescue inhaler

COPD

  • Rising CO₂, somnolence then CO₂ narcosis
  • Sputum change + fever = exacerbation
Complications

Asthma

  • Status asthmaticus
  • Full control possible
  • normal lifespan

COPD

  • Cor pulmonale
  • respiratory failure
  • Progressive lung-function decline

★ marks the fact that sets a column apart.

Clinical Pearl

Asthma clears between attacks; COPD never fully clears — if PFTs normalize, it's asthma.

Component Topics

Asthma — Pathophysiology & ManagementCOPD General Management

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