FROM MY PT SCHOOL NOTES · CARDIOPULMONARY · CHAPTER 3
Obstructive vs. Restrictive Lung Disease: What Changes for PT?
When someone becomes short of breath, understanding the underlying pattern is more useful than memorizing one breathing exercise for every diagnosis.
1. Identify what the pattern describes
Obstruction makes it difficult to expel air quickly, often because of airway narrowing, mucus, inflammation or reduced elastic recoil. COPD and asthma are examples of conditions that may cause obstructive physiology, but they are not interchangeable diseases.
Restriction involves reduced lung volume from conditions affecting lung tissue, chest wall, pleura or respiratory muscles. A reduced total lung capacity confirms restriction. A low forced vital capacity on spirometry alone does not prove it.
If FVC is low, can you diagnose a restrictive ventilatory defect immediately?
Reasoning: No. Lung volumes, particularly total lung capacity, and test quality are required to confirm restriction.
2. Make sense of the most familiar numbers
FEV1 is the amount forcibly exhaled in the first second; FVC is the total amount exhaled during a forced maneuver. FEV1/FVC helps recognize airflow obstruction. For example, 1.8 L divided by 3.0 L equals 0.60, which suggests obstruction if the maneuver is acceptable.
Updated standard: GOLD 2026 uses a post-bronchodilator FEV1/FVC ratio below 0.70 for COPD diagnosis in the appropriate clinical context. This replaces the older class note that a ratio above 75% is always normal. More general PFT interpretation uses reference equations and test quality.
Does a reduced FEV1/FVC identify the exact disease or prescribe a treatment by itself?
Reasoning: No. It describes physiology; diagnosis and treatment require clinical context and often further testing.
3. Match the rehabilitation plan to the limitation
Consider activity tolerance, dyspnea, oxygenation, cough or secretion burden, fatigue, strength, functional goals and comorbid disease. Physical activity and pulmonary rehabilitation can improve meaningful outcomes in appropriate chronic respiratory disease populations.
Breathing control, airway clearance, endurance training and strength training have different indications. Do not prescribe them as if every person with COPD, asthma or restrictive disease had the same mechanism or needs.
Would two patients with the same walking distance necessarily have the same impairment?
Reasoning: No. Similar outcomes can arise from different ventilatory, vascular, musculoskeletal or behavioral contributors.
Apply it to a clinical situation
Same complaint, different physiology: Two patients stop on the stairs because of breathlessness. One has COPD; the other has interstitial lung disease.
What matters most in this situation?
Reasoning: Assess their symptoms, oxygenation and exercise responses rather than assuming identical physiologic limitations or identical rehabilitation plans.
Common trap: Treating obstructive and restrictive labels as direct exercise prescriptions.
Source notes & learning scope
Class sources: “6 Chapter 5.pdf,” “7 Chapter 6.pdf,” and “Chapter 10.pdf.” Current references: GOLD 2026 and ERS/ATS lung-function interpretation. No copyrighted lecture figure reproduced. These are my reorganized class notes with newly written educational examples. This lesson is not a care protocol, official class resource or NPTE guarantee.
