Pulmonary · Topic 8 of 28

COPD Exacerbation

Pulmonary · obstructive lung disease

COPD Exacerbation

Controlled oxygen to 88–92%, SABA plus ipratropium, prednisone 40 mg for 5 days, antibiotics for purulent sputum — and NIV for hypercapnic acidosis.

Key numbers

Prednisone 40 mg for 5 days40 mg × 5 days

Antibiotics for purulent sputum or ventilation5 days

Titrate oxygen to SpO₂ 88–92%SpO₂ 88–92%

NIV for hypercapnic acidosispH ≤ 7.35, PaCO₂ ≥ 45

01 · Defined byNIV for hypercapnic acidosis

Start NIV (BiPAP) for respiratory acidosis (PaCO₂ ≥ 45 mmHg and pH ≤ 7.35), severe dyspnea with respiratory muscle fatigue, or persistent hypoxemia despite oxygen — it reduces intubation and mortality.

02 · DoTitrate oxygen to SpO₂ 88–92%

Give controlled oxygen (Venturi mask or nasal cannula) to SpO₂ 88–92% (PaO₂ about 60 mmHg); higher targets add little and worsen hypercapnia. Check an arterial blood gas.

03 · GivePrednisone 40 mg for 5 days

Give systemic glucocorticoid — prednisone 40 mg (or equivalent) daily for 5 days — for moderate or severe exacerbations; oral is as effective as IV, and longer courses are linked to pneumonia and death.

Causes & risk factors

Why it happens

Exclude mimics: pneumonia, PE, heart failure, pneumothoraxMost exacerbations are triggered by viral infection, but pneumonia, pulmonary embolism, acute heart failure, MI or arrhythmia, and pneumothorax mimic or worsen them — look for each.

Diagnosis & monitoring

Work-up

Intubate when NIV fails or cannot be usedIntubate for life-threatening hypoxemia despite NIV or high-flow, NIV intolerance, falling consciousness or uncontrolled agitation, inability to clear secretions or protect against aspiration, refractory shock, severe arrhythmia, or after arrest.

Rome severity: count dyspnea, RR, HR, SaO₂, CRPRome moderate = ≥ 3 of: dyspnea VAS ≥ 5, RR ≥ 24, HR ≥ 95, SaO₂ < 92% (or fall > 3%), CRP ≥ 10 mg/L. Severe adds PaO₂ ≤ 60 and/or hypercapnic acidosis.

ICU for worsening gases or mental statusAdmit to the ICU for hypoxemia or hypercapnia worsening despite ventilatory support, worsening mental status (confusion, lethargy, coma), need for invasive ventilation, or hemodynamic instability requiring vasopressors.

Do right now

In this order

First moves

Titrate oxygen to SpO₂ 88–92%SpO₂ 88–92%

→

Start albuterol with or without ipratropium

→

Prednisone 40 mg for 5 days40 mg × 5 days

→

Antibiotics for purulent sputum or ventilation5 days

→

NIV for hypercapnic acidosispH ≤ 7.35, PaCO₂ ≥ 45

Why each step

Titrate oxygen to SpO₂ 88–92%Give controlled oxygen (Venturi mask or nasal cannula) to SpO₂ 88–92% (PaO₂ about 60 mmHg); higher targets add little and worsen hypercapnia. Check an arterial blood gas.

Start albuterol with or without ipratropiumInhaled short-acting beta-agonist (albuterol), with or without short-acting anticholinergic (ipratropium), is the initial bronchodilator; MDI with spacer equals nebulizer, and nebulizers should be air-driven, not oxygen-driven.

Prednisone 40 mg for 5 daysGive systemic glucocorticoid — prednisone 40 mg (or equivalent) daily for 5 days — for moderate or severe exacerbations; oral is as effective as IV, and longer courses are linked to pneumonia and death.

Antibiotics for purulent sputum or ventilationGive antibiotics (usually for 5 days) when sputum purulence increases plus more dyspnea or sputum volume, after a prior positive sputum culture, or whenever the patient needs NIV or invasive ventilation.

NIV for hypercapnic acidosisStart NIV (BiPAP) for respiratory acidosis (PaCO₂ ≥ 45 mmHg and pH ≤ 7.35), severe dyspnea with respiratory muscle fatigue, or persistent hypoxemia despite oxygen — it reduces intubation and mortality.

Management

Orders

Antibiotic choice: amoxicillin-clavulanate, macrolide or doxycyclineEmpiric antibiotics follow local resistance: amoxicillin-clavulanate, a macrolide or a tetracycline; culture sputum and consider Pseudomonas coverage with frequent exacerbations, severe airflow obstruction or mechanical ventilation.

Give VTE prophylaxis to hospitalized patientsHospitalized COPD patients have high VTE risk (pulmonary embolism found in up to 5.9%); give heparin or LMWH prophylaxis and monitor fluid balance.

Discharge on long-acting bronchodilators, triple if eosinophilicStart long-acting bronchodilators (LABA + LAMA) before discharge; after ≥ 1 moderate or severe exacerbation with raised blood eosinophils, consider adding an ICS (triple therapy) at discharge.

Follow up within 1 month; start rehab earlySee the patient within 1 month of discharge (fewer readmissions) and again at 3 months with spirometry; start pulmonary rehabilitation within 4 weeks of discharge.

Red flags & don'ts

Avoid harm

No IV theophylline or aminophylline avoidMethylxanthines (IV aminophylline or theophylline) are not recommended in exacerbations: toxicity exceeds benefit.

Commonly confused

Tell apart

Hypercapnic failure: NIV over high-flow oxygenHigh-flow nasal oxygen is the first-line support for hypoxemic failure (or NIV intolerance), but NIV is preferred for hypercapnic respiratory failure; failure to improve on high-flow means switching to NIV.

More detail

Reference

Show 7 reference facts

NIV can be stopped directly, without weaning, once the patient tolerates at least 4 hours of unassisted breathing.

Home oxygen started at discharge is often no longer needed: reassess the need 60–90 days after discharge.

Many patients retain CO₂ chronically (raised bicarbonate), so severe CNS depression is unlikely until PaCO₂ exceeds about 85 mmHg; oxygen is still given despite the hypercapnia risk.

After a hospitalized exacerbation, 5-year mortality is about 50%, and cardiovascular event risk stays elevated for up to 1 year.

Procalcitonin-guided antibiotic decisions are not recommended (conflicting data, higher mortality in one ICU study); point-of-care CRP may safely reduce antibiotic use in outpatients.

Antitussives have no role in exacerbations, and opioids are used sparingly because they suppress cough and mental status.

GOLD advises checking hospitalized patients for severe vitamin D deficiency (< 10 ng/mL) and supplementing, which may reduce exacerbations.

Pearl

Too much oxygen hurts the CO₂ retainer: aim for 88–92%, and let NIV — not more oxygen — fix the respiratory acidosis.

Sources · GOLD 2026 Report — Global Strategy for the Diagnosis, Management, and Prevention of COPD (Chapter 4: Management of Exacerbations) · Merck Manual Professional — Treatment of Acute COPD Exacerbation · GOLD 2026 Teaching Slide Set (Figures 4.4, 4.5, 4.6, 4.8, 4.9) · Merck Manual Professional — Cardiovascular Examination (SpO₂ target 88–92% in COPD) · GOLD 2026 Pocket Guide to COPD Diagnosis, Management, and Prevention · Rochwerg B et al. Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure. Eur Respir J 2017;50:1602426 · Starter sheet built from the verified AGACNP fact map (facts reviewed 2026-10-15).