COPD Exacerbation

Key considerations: Pneumothorax, Pulmonary embolism, Acute heart failure

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history: Baseline functional status and O2 requirement; Increased dyspnea, sputum volume, sputum purulence (Anthonisen criteria); Current medications: inhalers, home O2, prior systemic steroids; Prior exacerbations: frequency, intubations, ICU admissions; Triggers: infection, air quality, cold air, medication non-compliance; exam: Respiratory rate, SpO2 on and off supplemental O2; Lung: wheezes, decreased breath sounds, prolonged expiration; Accessory muscle use, pursed lip breathing; Signs of right heart failure: JVD, peripheral edema, hepatomegaly; Mental status: drowsiness suggests CO2 retention; labs: VBG/ABG: pH, PCO2, HCO3 — compare to baseline if available; CBC: WBC for infection; BMP: electrolytes; BNP: differentiate COPD from heart failure; Procalcitonin: guide antibiotic use; Sputum culture if intubated or severe; imaging: CXR: infiltrate (pneumonia), pneumothorax, pulmonary edema; CT chest if PE suspected or CXR inconclusive; bedside: Point-of-care VBG for rapid pH and CO2 assessment; Lung ultrasound: A-lines (COPD) vs B-lines (heart failure); 12-lead ECG: RV strain, arrhythmia, ischemia

immediate: Supplemental O2: target SpO2 88–92% (avoid hyperoxia → CO2 retention); Albuterol + ipratropium nebulizers; Systemic corticosteroids: prednisone 40mg PO or methylprednisolone 125mg IV; BiPAP if respiratory distress or CO2 retention (pH <7.35) — reduces intubation rates; general: Anthonisen criteria for antibiotics: increased dyspnea + increased sputum volume + increased sputum purulence (2 of 3 = antibiotics indicated); If antibiotics indicated: azithromycin 500mg PO day 1, then 250mg x4 days OR doxycycline 100mg BID x5 days; Prednisone 40mg PO x5 days (REDUCE trial: 5 days as effective as 14); specific: diagnosis: Mild Exacerbation; steps: Increase bronchodilator frequency; Short course prednisone 40mg x5 days; Antibiotics if purulent sputum; Discharge with close follow-up; diagnosis: Moderate-Severe (Hypercapnic); steps: BiPAP: start 10/5 cmH2O, titrate to comfort and VBG improvement; Continuous nebulized bronchodilators; IV steroids; Repeat VBG in 1-2 hours to assess response; diagnosis: Respiratory Failure / Intubation; steps: Intubation if BiPAP fails, altered mental status worsens, or hemodynamically unstable; Low tidal volume, long expiratory time — prevent auto-PEEP; ICU admission; Evaluate goals of care — many COPD patients have advance directives

admit: Hypoxia not corrected with supplemental O2; Hypercapnia with acidosis (pH <7.35); Requiring BiPAP; Unable to ambulate or eat; Significant comorbidities; Pneumonia or sepsis; discharge: Return to baseline on current O2; Able to eat, ambulate, use inhalers; SpO2 ≥88% on home O2 or room air; Follow-up within 1 week; Prescriptions: prednisone burst, antibiotics if indicated, rescue inhaler; consults: Pulmonology: refractory exacerbation, new home O2 need, LTOT evaluation; Palliative care: recurrent exacerbations, goals of care discussion

BiPAP in COPD exacerbation reduces intubation rates by ~65% — use early, not as a last resort
Target SpO2 88–92% in COPD — hyperoxia reduces hypoxic respiratory drive and worsens CO2 retention
Prednisone 40mg x5 days is as effective as 14 days (REDUCE trial) — shorter courses reduce side effects
If lung ultrasound shows B-lines in a "COPD" patient, consider heart failure as primary or contributing diagnosis
Check goals of care early in severe exacerbations — many COPD patients may not want intubation

GOLD COPD Guidelines 2024, ATS/ERS COPD Exacerbation Statement. Last reviewed: 2024-11-01