side by side comparison
Obstructive vs Restrictive Lung Disease: Air Trapping vs Reduced Expansion — The Fundamental Classification
Every lung disease on the NCLEX maps to one of two patterns — air trapping or restricted expansion. If you can't classify the pattern, you'll misread PFT results, misinterpret breath sounds, and pick the wrong oxygen strategy. This single framework unlocks every respiratory question.
Master this comparison — play it or drill it.
Practice 49 NCLEX-style questions
Practice nowComparison
Side-by-side2 compared
Focus
Dimension
Obstructive
Restrictive
Pathophysiology & risk
- ★Airway narrowing — air can't get OUT
- Asthma, COPD, CF, bronchiectasis
- ★Stiff lungs/chest — air can't get IN
- ARDS, fibrosis, scoliosis, GBS, MG
Signs & symptoms
- Wheezing
- Prolonged expiration
- Barrel chest
- Hyperresonant percussion
- Fine crackles (fibrosis)
- Rapid shallow breathing
- Reduced chest expansion
- Dull percussion
Diagnostics & labs
- ★FEV₁/FVC < 70% — FEV₁ drops most
- TLC ↑, RV ↑ (air trapped)
- FEV₁/FVC normal or ↑
- TLC ↓, RV ↓ (can't inflate)
Nursing priorities
- COPD: target SpO₂ 88–92%
- High FiO₂ can ↑ CO₂ (COPD)
- Tripod position to ease breathing
- High FiO₂ often needed (ARDS)
- PEEP to open alveoli (ARDS)
- Prone positioning (severe ARDS)
Management
- Bronchodilators (SABA, LABA)
- Inhaled corticosteroids (ICS)
- IVIG or plasmapheresis (GBS/MG)
- Lung-protective ventilation (ARDS)
Patient teaching
- Inhaler technique
- Smoking cessation
- Pursed-lip breathing
- Energy conservation
- Incentive spirometry, deep breaths
- Energy conservation
Red flags — escalate
- Rising CO₂, somnolence (COPD)
- Silent chest / no air movement
- Falling vital capacity (GBS/MG)
- Refractory hypoxia (ARDS)
Complications
- Asthma reversible, COPD not
- Cor pulmonale
- Chronic respiratory failure
- Fibrosis is irreversible
- Cor pulmonale
- Chronic respiratory failure
Pathophysiology & risk
Obstructive
- ★Airway narrowing — air can't get OUT
- Asthma, COPD, CF, bronchiectasis
Restrictive
- ★Stiff lungs/chest — air can't get IN
- ARDS, fibrosis, scoliosis, GBS, MG
Signs & symptoms
Obstructive
- Wheezing
- Prolonged expiration
- Barrel chest
- Hyperresonant percussion
Restrictive
- Fine crackles (fibrosis)
- Rapid shallow breathing
- Reduced chest expansion
- Dull percussion
Diagnostics & labs
Obstructive
- ★FEV₁/FVC < 70% — FEV₁ drops most
- TLC ↑, RV ↑ (air trapped)
Restrictive
- FEV₁/FVC normal or ↑
- TLC ↓, RV ↓ (can't inflate)
Nursing priorities
Obstructive
- COPD: target SpO₂ 88–92%
- High FiO₂ can ↑ CO₂ (COPD)
- Tripod position to ease breathing
Restrictive
- High FiO₂ often needed (ARDS)
- PEEP to open alveoli (ARDS)
- Prone positioning (severe ARDS)
Management
Obstructive
- Bronchodilators (SABA, LABA)
- Inhaled corticosteroids (ICS)
Restrictive
- IVIG or plasmapheresis (GBS/MG)
- Lung-protective ventilation (ARDS)
Patient teaching
Obstructive
- Inhaler technique
- Smoking cessation
- Pursed-lip breathing
- Energy conservation
Restrictive
- Incentive spirometry, deep breaths
- Energy conservation
Red flags — escalate
Obstructive
- Rising CO₂, somnolence (COPD)
- Silent chest / no air movement
Restrictive
- Falling vital capacity (GBS/MG)
- Refractory hypoxia (ARDS)
Complications
Obstructive
- Asthma reversible, COPD not
- Cor pulmonale
- Chronic respiratory failure
Restrictive
- Fibrosis is irreversible
- Cor pulmonale
- Chronic respiratory failure
★ marks the fact that sets a column apart.
Tap the column each item belongs to — jump in and play, or just watch it run.
Play full screen for XPGame:
Clinical Pearl
Can't blow OUT = obstructive (low FEV1/FVC). Can't breathe IN = restrictive (low TLC, ratio preserved).
Component Topics
Ready to master this comparison?
Get a personalized study plan built around this topic — free to try, no card needed.
Go further
- TopicAcute Respiratory Distress Syndrome — ARDSA patient's PaO2 stays dangerously low despite 100% oxygen — that refractory hypoxemia is the hallmark that separates ARDS from other respiratory failures and changes everything…
- TopicAsthmaAsthma and COPD both cause airflow obstruction, but only one is fully reversible — and that reversibility drives every management decision you'll see on the NCLEX.
- ComparisonAsthma vs COPD: Reversible vs Irreversible Airway DiseaseBoth 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…
- Commonly confusedAsthma vs COPDReversible vs irreversible airway disease — similar wheeze, different management.