Acute Exacerbation of COPD (AECOPD) for MD exams

High-yield GOLD 2025-aligned framework (with available retrieved sources + standard guideline knowledge)

1) Definition and severity

1. Mild: managed with short-acting bronchodilators (SABD) only
2. Moderate: needs SABD + oral corticosteroids and/or antibiotics
3. Severe: requires ER visit or hospitalization; may progress to acute respiratory failure

• Pharmacotherapy in Patients With Stable COPD (p.16)

2) Etiology / triggers (viva favorite)

• Infections (most common): viral (rhinovirus, influenza, RSV), bacterial (H. influenzae, S. pneumoniae, Moraxella catarrhalis)
• Air pollution / particulate exposure
• Poor inhaler adherence or incorrect technique
• Comorbid events: heart failure, PE, pneumothorax, arrhythmia, ACS, aspiration
• Sometimes no clear trigger identified

3) Clinical assessment in ER/ward

History

• Baseline COPD severity, prior exacerbations/hospitalizations/ICU
• Current symptoms: dyspnea, sputum amount/color, fever, chest pain, confusion
• Home oxygen/NIV use, medications, smoking status

Examination

• RR, accessory muscle use, inability to speak full sentences
• SpO2, cyanosis, mental status (CO2 narcosis risk)
• Signs of right heart strain, edema, pneumonia, pneumothorax

Investigations

• ABG (especially if severe distress, low saturation, drowsiness)
• CBC, CRP/procalcitonin (where used), electrolytes, renal function
• CXR (exclude pneumonia, edema, PTX)
• ECG/troponin if cardiac concern
• Viral testing during outbreaks
• Sputum culture in severe/frequent/refractory cases

4) Initial management algorithm (exam flow)

A. Oxygen (controlled)

• Target SpO2 88 to 92%
• Use Venturi or titrated nasal oxygen
• Recheck ABG to avoid oxygen-induced hypercapnia/acidosis

B. Bronchodilators

• SABA (salbutamol) +/- SAMA (ipratropium), repeated/neb initially
• Once stable, transition to inhaler + spacer

C. Systemic corticosteroids

• Prednisolone 40 mg PO daily for 5 days (or IV equivalent if unable to take PO)
• Short course preferred; improves FEV1, oxygenation, recovery time; reduces early relapse

D. Antibiotics (only when indicated)

• Increased dyspnea + increased sputum volume + increased sputum purulence (all 3), or
• Purulent sputum + one other cardinal symptom, or
• Need for mechanical ventilation (invasive or NIV)

• Uncomplicated: amox-clav / macrolide / doxycycline
• Pseudomonas risk or severe disease: antipseudomonal regimen per local policy

• Pharmacologic Management of COPD Exacerbations (p.2)

E. Ventilatory support

Start NIV (BiPAP) if:

• Respiratory acidosis (e.g., pH ≤7.35 with raised PaCO2)
• Severe dyspnea with increased work of breathing
• Persistent hypoxemia despite oxygen

Intubation/ICU if:

• NIV failure/contraindication
• Worsening acidosis, hypoxemia, altered sensorium, hemodynamic instability, arrest risk

5) Admission criteria (practical)

• Marked symptom intensity or acute respiratory failure
• New cyanosis/edema, altered mental status
• Serious comorbidity (HF, arrhythmia, pneumonia, PE, ACS)
• Poor home support or failed outpatient treatment
• Frequent exacerbations/high-risk history

6) Discharge readiness

• Symptoms and bronchodilator need near baseline
• Stable for 12 to 24 h, able to ambulate/eat/sleep
• SpO2 acceptable on stable oxygen plan
• Correct inhaler technique demonstrated
• Clear medication + action plan + follow-up arranged

7) Post-exacerbation prevention (high scoring in exams)

1. Optimize maintenance inhaled therapy (LABA/LAMA +/- ICS as indicated by eosinophils/exacerbation profile)
2. Smoking cessation
3. Vaccination (influenza, pneumococcal, COVID, RSV as indicated)
4. Pulmonary rehabilitation (especially after hospitalization)
5. Education: inhaler technique, adherence, written action plan
6. Review comorbidities (CVD, anxiety/depression, GERD, OSA, bronchiectasis)
7. Consider long-term strategies in selected patients:
   • Roflumilast (chronic bronchitis phenotype with frequent exacerbations)
   • Long-term macrolide in selected non-smokers (watch QT/hearing/resistance)

8) Common exam traps

• Giving uncontrolled high-flow oxygen to CO2 retainers
• Overusing antibiotics without sputum purulence/criteria
• Long steroid courses when 5 days is usually enough
• Missing alternate diagnoses: PE, pneumothorax, HF, ACS, pneumonia
• Discharge without inhaler training/action plan

9) 30-second viva summary

1. Exact ward prescription format (ER to discharge),
2. NIV settings and ABG interpretation table,
3. MD exam long-answer template (10-marker).

Acute Exacerbation of COPD (AECOPD): complete MD exam master notes

1) Definition

• Increased dyspnea
• Increased cough/sputum volume
• Increased sputum purulence
• With or without wheeze, chest tightness, fatigue, reduced exercise tolerance, peripheral edema, confusion

1. Mild: SABA only
2. Moderate: SABA + oral steroid and/or antibiotic
3. Severe: ER/hospital admission, often with acute respiratory failure

2) Why exacerbations matter

• Faster decline in lung function
• Worse quality of life and exercise capacity
• Increased risk of next exacerbation
• Increased mortality, especially after severe/hospitalized episodes
• Higher healthcare costs and readmission risk

3) Etiology and triggers

A) Infectious (most common)

• Viral: rhinovirus, influenza, RSV, parainfluenza, coronavirus
• Bacterial: Haemophilus influenzae, Streptococcus pneumoniae, Moraxella catarrhalis
• Severe/advanced disease: Pseudomonas aeruginosa, gram-negatives

B) Non-infectious

• Air pollution, smoke, occupational irritants
• Temperature extremes
• Poor adherence to inhalers
• Sedatives/opioids causing hypoventilation
• Recent surgery/immobility

C) Mimics/alternate diagnoses to always exclude

• Pneumonia
• Acute left ventricular failure/pulmonary edema
• Pulmonary embolism
• Pneumothorax
• Pleural effusion
• Arrhythmia/ACS
• Upper airway obstruction
• Metabolic acidosis/sepsis

4) Pathophysiology (high-yield viva)

• Trigger causes amplified airway and systemic inflammation
• Increased mucus production + airway edema + bronchospasm
• Worsened expiratory flow limitation and dynamic hyperinflation
• Ventilation-perfusion mismatch -> hypoxemia
• Respiratory muscle load rises -> fatigue
• Hypercapnia develops from alveolar hypoventilation
• Severe episodes can cause acute-on-chronic respiratory acidosis and right heart strain

5) Clinical assessment in ER/ward

A) Focused history

• Baseline COPD severity, prior spirometry if available
• Baseline dyspnea and usual sputum
• Number of exacerbations in past year
• Prior ICU/intubation/NIV
• Current meds, adherence, inhaler technique
• Home oxygen/NIV use
• Comorbidities (HF, CAD, diabetes, CKD, OSA)
• Current fever, pleuritic pain, hemoptysis, leg swelling, altered sensorium

B) Examination

• Vitals: RR, HR, BP, temp, SpO2
• Work of breathing: accessory muscles, paradoxical breathing
• Ability to speak full sentences
• Mental status: agitation, drowsiness, confusion (hypercapnia warning)
• Chest: wheeze/reduced air entry/crackles
• Cardiac signs, edema, JVP, DVT signs

C) Severity red flags

• Silent chest
• Severe hypoxemia
• Rising PaCO2 with acidosis
• Altered consciousness
• Hemodynamic instability
• Exhaustion/impending arrest

6) Investigations

• Pulse oximetry continuously
• ABG (especially moderate-severe, low saturation, drowsiness)
• CBC, electrolytes, renal function, glucose
• Chest X-ray
• ECG

• CRP/procalcitonin (local policy)
• Troponin/BNP if cardiac suspicion
• D-dimer/CTPA if PE suspicion
• Viral panel during season/outbreak
• Sputum Gram stain/culture in severe/frequent/non-responders
• Lactate if sepsis concern

• Mild-moderate: hypoxemia with/without hypercapnia
• Severe: acute-on-chronic hypercapnic respiratory failure (pH low, PaCO2 high)
• Chronic retainers may have elevated bicarbonate baseline

7) Differential diagnosis table

8) Management algorithm (exam-ready)

Step 1: Controlled oxygen

• Target SpO2 88 to 92% (unless another indication mandates higher)
• Use Venturi mask or carefully titrated nasal cannula
• Repeat ABG after oxygen changes to avoid CO2 narcosis

Step 2: Bronchodilators

• SABA: salbutamol nebulized or MDI-spacer repeated
• Add SAMA: ipratropium
• Frequent dosing initially, then spacing as improves

Step 3: Systemic corticosteroids

• Prednisolone 40 mg PO once daily for 5 days
• If unable oral: IV methylprednisolone/hydrocortisone equivalent
• Benefits: shorter recovery, better FEV1/oxygenation, lower treatment failure

Step 4: Antibiotics only when indicated

• All 3 cardinal symptoms: increased dyspnea + sputum volume + sputum purulence
• Or 2 symptoms if one is purulence
• Or patient requires NIV/intubation
• Or radiologic pneumonia/sepsis features

• Uncomplicated: amox-clav, doxycycline, azithromycin/clarithromycin
• Complicated/frequent exacerbator/severe obstruction/recent antibiotics: broader coverage
• Pseudomonas risk (bronchiectasis, prior Pseudomonas, repeated admissions): antipseudomonal beta-lactam +/- second agent per protocol Duration usually 5 days (longer if severe/slow response)

Step 5: Ventilatory support

NIV (BiPAP) indications

• Persistent acute hypercapnic acidosis (typically pH 7.25 to 7.35 with elevated PaCO2)
• Severe dyspnea with increased work of breathing
• Persistent hypoxemia despite optimized oxygen

• Reduces intubation, mortality, complications, LOS

• Cardiorespiratory arrest
• Inability to protect airway, vomiting/aspiration risk
• Severe agitation/uncooperative
• Facial trauma/burn/recent upper airway surgery
• Copious secretions not manageable
• Hemodynamic instability/shock (relative)

• IPAP 10 to 12 cm H2O, EPAP 4 to 5 cm H2O
• Increase IPAP gradually (often 14 to 20) to reduce PaCO2 and distress
• Titrate FiO2 for SpO2 88 to 92%
• Recheck ABG in 1 to 2 hours

Intubation/IMV indications

• NIV failure (worsening pH, rising CO2, worsening distress)
• Refractory hypoxemia
• Reduced consciousness
• Hemodynamic collapse/arrhythmias
• Inability to clear secretions/airway protection failure

9) Adjunct inpatient care

• DVT prophylaxis
• Adequate hydration and nutrition
• Controlled glucose (especially with steroids)
• Electrolyte correction (K, Mg, phosphate)
• Chest physiotherapy/airway clearance when needed
• Treat comorbid triggers (HF, ACS, arrhythmia, PE, infection)
• Avoid unnecessary sedatives
• Early mobilization

• Routine aminophylline/theophylline not recommended due to side effects and limited added benefit

• Not standard acute rescue for all; selective use per local practice

10) Admission, ICU, and discharge criteria

Admit if:

• Marked dyspnea not responding in ED
• Hypoxemia/hypercapnia/acidosis
• Significant comorbidity
• New arrhythmia/heart failure/pneumonia
• Altered mental status
• Poor social support or inadequate home care
• Frequent exacerbations/high-risk history

ICU/HDU if:

• Need for NIV with close monitoring
• Severe acidosis/rapid deterioration
• Need for IMV or post-intubation care
• Hemodynamic instability

Discharge when:

• Bronchodilator interval stable (usually 4+ hours)
• Ambulatory and symptomatically near baseline
• Oxygen requirement stable and safe
• Eating/sleeping adequately
• Inhaler technique checked
• Follow-up and action plan arranged

11) Discharge medications and transition plan

• Resume/optimize maintenance inhalers:
  • LABA + LAMA backbone in most symptomatic patients
  • Add ICS (triple therapy) in frequent exacerbators and/or eosinophil-guided selection
• Complete steroid and antibiotic courses
• PRN SABA rescue with clear instructions
• Smoking cessation pharmacotherapy + counseling
• Vaccinations update
• Pulmonary rehab referral (especially post-hospitalization)
• Written action plan:
  • What worsening signs to watch
  • How to step-up rescue therapy
  • When to seek ER care
• Follow-up:
  • Early review in 1 to 4 weeks post-exacerbation
  • Reassess inhaler technique, adherence, eosinophils, exacerbation risk

12) Prevention of future exacerbations

1. Smoking cessation (highest impact)
2. Correct inhaler use and adherence
3. Vaccines: influenza annually, pneumococcal, COVID updates, RSV per age/risk policy
4. Pulmonary rehabilitation
5. Optimize bronchodilator regimen and phenotype-based therapy
6. Consider roflumilast in chronic bronchitis + severe airflow limitation + frequent exacerbations
7. Consider long-term macrolide in selected frequent exacerbators (monitor QT, hearing, resistance)
8. Manage comorbidities and environmental exposures
9. Nutritional support and physical activity

13) Complications of AECOPD

• Acute-on-chronic respiratory failure
• Need for invasive ventilation
• Nosocomial infections
• Arrhythmias/ischemia
• VTE
• Deconditioning and frailty
• Readmission and mortality increase

14) Prognostic factors (poor outcome predictors)

• Previous severe exacerbation/hospitalization
• Frequent exacerbator phenotype
• Severe airflow limitation, chronic hypercapnia
• Older age, low BMI, frailty
• Multiple comorbidities
• Persistent hypoxemia
• Delayed presentation
• Poor social support/adherence

15) Exam long-answer structure (10-15 marker)

1. Definition + severity classification
2. Etiology/triggers + differentials
3. Clinical features and red flags
4. Investigations (ABG, CXR, ECG, labs)
5. Management algorithm:
   • Controlled oxygen
   • SABA/SAMA
   • Steroid 5 days
   • Antibiotic indications
   • NIV and intubation criteria
6. Monitoring and complications
7. Discharge criteria
8. Secondary prevention and follow-up

16) Common mistakes in exams/clinics

• Not mentioning oxygen target 88 to 92%
• Missing ABG-based escalation
• Overprescribing antibiotics without purulence criteria
• Long steroid taper unnecessarily
• Forgetting DVT prophylaxis in admitted patients
• Ignoring differential diagnoses (PE, PTX, HF, ACS)
• No discharge action plan and inhaler training

17) Quick prescription template (adult, typical)

• Oxygen via Venturi, titrate to SpO2 88 to 92%
• Neb salbutamol 2.5 to 5 mg + ipratropium 0.5 mg q4-6h (initially more frequent)
• Prednisolone 40 mg PO OD x 5 days
• Antibiotic if indicated (example amox-clav 625 mg TID x 5 days; local protocol first)
• DVT prophylaxis (if admitted and no contraindication)
• ABG repeat in 1 to 2 h if moderate-severe or on NIV/oxygen escalation
• NIV if hypercapnic acidosis with distress
• Continue/step-up maintenance LABA/LAMA +/- ICS before discharge

18) One-page viva pearls

• Diagnosis is clinical; always search for trigger and mimic
• Controlled oxygen is treatment, not unlimited oxygen
• SABA + SAMA + short systemic steroid course is core
• Antibiotics are conditional, not universal
• NIV early in hypercapnic acidosis saves intubations
• Exacerbation discharge is a prevention opportunity

1. Case-based ABG interpretation drills (5 exam-style cases)
2. Exact COPD exacerbation OSCE answer sheet
3. Pocket mnemonics for management and antibiotic selection