Asthma vs. COPD in the Field: Assessment and Treatment Differences
A prehospital comparison of asthma and COPD: history, breath sounds, capnography, and where the treatments diverge for EMTs, AEMTs, and paramedics.
June 1, 2026 · 8 min read
Both patients wheeze. Both look scared. Both want a breathing treatment. But the underlying pathology — and a few key treatment decisions — differ enough that the NREMT builds entire scenarios around distinguishing them.
History that separates them
- Asthma: reversible bronchospasm, often younger patient, clear triggers (exercise, cold air, allergen).
- COPD: chronic, progressive, older patient with a smoking history, baseline dyspnea on exertion.
Assessment findings
Asthma classically presents with expiratory wheezes and a prolonged expiratory phase. A silent chest is a late, ominous sign. COPD often has diminished breath sounds throughout, barrel chest, and pursed-lip breathing. Capnography waveforms in both show a shark-fin — but the COPD baseline ETCO₂ may run chronically higher.
Treatment differences
- Albuterol/ipratropium: indicated for both.
- CPAP: excellent for both when the patient is awake and cooperative.
- Oxygen: titrate to SpO₂ 88–92% for COPD to avoid blunting hypoxic drive; 94–99% for asthma.
- Epinephrine 1:1,000 IM: severe asthma exacerbation not responding to nebulizers (per protocol).
When in doubt on the exam: treat what you can see (bronchospasm) and don't over-oxygenate a COPD patient into apnea.
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