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Asthma Exacerbation - CCS Case Guide
Key Takeaway: Acute asthma exacerbation is a common CCS case that tests your ability to escalate bronchodilator therapy, initiate systemic corticosteroids early, monitor response with peak flow measurements, and make appropriate disposition decisions based on severity. Recognizing impending respiratory failure and knowing when to intubate are critical for advanced cases.
Acute asthma exacerbation is a common CCS case that tests your ability to escalate bronchodilator therapy, initiate systemic corticosteroids early, monitor response with peak flow measurements, and make appropriate disposition decisions based on severity. Recognizing impending respiratory failure and knowing when to intubate are critical for advanced cases.
Recognizing the Asthma Exacerbation Presentation
- History: Progressive dyspnea, wheezing, chest tightness, and cough; may have known asthma history with recent trigger exposure (URI, allergens, exercise, cold air, medication noncompliance)
- Physical Exam: Diffuse expiratory wheezing, prolonged expiratory phase, accessory muscle use, tachypnea; absent breath sounds ("silent chest") indicates severe obstruction
- Vital Signs: Tachypnea, tachycardia, possible hypoxia (SpO2 <95%); pulsus paradoxus >12 mmHg suggests severe exacerbation
- Severity Assessment: Mild: PEF >70% predicted, speaks in sentences; Moderate: PEF 40-69%, speaks in phrases; Severe: PEF <40%, speaks in words, accessory muscle use; Life-threatening: silent chest, drowsiness, cyanosis
- Risk Factors for Fatal Asthma: Prior intubation, ICU admission for asthma, ≥2 hospitalizations or ≥3 ED visits in past year, recent oral corticosteroid use, poor perception of dyspnea
Immediate Actions (First 5 Minutes)
These orders should be placed immediately — timing is scored:
Critical First Orders
- ✓ Continuous pulse oximetry and place on supplemental oxygen to maintain SpO2 ≥92%
- ✓ Nebulized albuterol 2.5 mg every 20 minutes for 3 doses (or continuous nebulization for severe)
- ✓ Nebulized ipratropium bromide 0.5 mg with first 3 albuterol treatments
- ✓ Systemic corticosteroids: prednisone 40-60 mg PO or methylprednisolone 125 mg IV
- ✓ Measure peak expiratory flow (PEF) before and after treatment
- ✓ Obtain ABG if severe distress or SpO2 <92%
Complete Workup
After initial stabilization, complete the diagnostic workup:
- Peak expiratory flow (PEF) at presentation and after each treatment cycle
- Pulse oximetry (continuous)
- ABG if severe exacerbation (watch for normal or rising PaCO2 — sign of fatigue)
- Chest X-ray (rule out pneumothorax, pneumonia, or other complications)
- CBC (leukocytosis expected from steroids and stress; evaluate for infection)
- BMP (electrolytes; albuterol may cause hypokalemia)
- Blood gas if impending respiratory failure suspected
- Consider BNP if heart failure in differential
Treatment
Bronchodilators
- Albuterol nebulizer 2.5 mg every 20 minutes x 3, then every 1-4 hours
- Continuous albuterol nebulization (10-15 mg/hr) for severe exacerbation
- Ipratropium bromide 0.5 mg nebulizer with first 3 albuterol doses
- Consider IV magnesium sulfate 2 g over 20 minutes for severe exacerbation not responding to initial therapy
Corticosteroids
- Prednisone 40-60 mg PO (if able to take oral) or methylprednisolone 125 mg IV
- Continue oral prednisone 40-60 mg daily for 5-7 days (no taper needed for short courses)
- Administer within first hour — early steroids reduce admission rates
Refractory or Life-Threatening
- IV magnesium sulfate 2 g over 20 minutes
- Epinephrine 0.3-0.5 mg IM for anaphylaxis-associated bronchospasm or severe refractory cases
- Heliox (helium-oxygen mixture) to reduce work of breathing
- Noninvasive positive pressure ventilation (BiPAP) as bridge
- Intubation and mechanical ventilation for respiratory failure (use ketamine for induction; low RR, prolonged expiratory time)
Discharge Medications
- Albuterol MDI with spacer as rescue inhaler
- Oral prednisone burst to complete 5-7 day course
- Initiate or step up controller therapy (inhaled corticosteroid ± LABA)
- Provide asthma action plan
Common Pitfalls
Scoring Tip: These are the most commonly missed actions for Asthma Exacerbation cases.
- Delaying systemic corticosteroids (should be given within the first hour)
- Interpreting a normal PaCO2 during acute exacerbation as reassuring (it suggests respiratory muscle fatigue)
- Failing to reassess PEF after treatment to guide disposition
- Not providing ipratropium with initial albuterol treatments for moderate-to-severe exacerbation
- Discharging without prescribing an inhaled corticosteroid controller
- Not recognizing a "silent chest" as a sign of impending respiratory arrest
Disposition
- Discharge if PEF >70% predicted, symptoms resolved, and SpO2 >94% after treatment
- Admit to floor if PEF 40-69% predicted after treatment or incomplete response
- Admit to ICU for PEF <40%, rising PaCO2, altered mental status, or requiring continuous nebulization
- Schedule follow-up with PCP or pulmonology within 1 week
Key Orders Checklist
- ☐ Albuterol nebulizer
- ☐ Ipratropium nebulizer
- ☐ Prednisone 40-60 mg PO or methylprednisolone 125 mg IV
- ☐ Peak expiratory flow measurement
- ☐ Continuous pulse oximetry
- ☐ Chest X-ray
- ☐ ABG (if severe)
- ☐ BMP
- ☐ Magnesium sulfate IV (if refractory)
- ☐ Inhaled corticosteroid prescription at discharge
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