Asthma Exacerbation: Red Flags and Rescue
What it is
Asthma is chronic airway inflammation with reversible bronchoconstriction, mucosal edema and mucus plugging, triggered by allergens, viral infection, exercise, cold air, smoke, NSAIDs and beta blockers. In an exacerbation, air is trapped behind narrowed airways. Early hyperventilation lowers PaCO2; a normal or rising PaCO2 during distress means the client is tiring and respiratory failure is near.
What the NCLEX focuses on
- Severe attack: speaks in words only, sits hunched forward, uses accessory muscles, respiratory rate above 30/min, heart rate above 120/min, SpO2 below 90%, peak flow 50% or less of personal best.
- A silent chest with drowsiness means almost no air movement and impending respiratory arrest, not improvement.
- Rescue: inhaled short-acting beta2-agonist (albuterol), ipratropium in severe attacks, early systemic corticosteroid, oxygen to target; IV magnesium sulfate for a severe attack that does not respond.
- Long-acting beta2-agonists (salmeterol), inhaled corticosteroids and montelukast are controllers, not rescue drugs.
- Using the rescue inhaler more than 2 days a week signals poor control.
- Inhaled corticosteroids cause oral candidiasis; rinse and spit after each dose.
- Montelukast carries a warning for mood changes and suicidal thoughts.
Priority nursing actions
- Sit the client upright and stay with the client.
- Give the prescribed short-acting bronchodilator by nebulizer or metered-dose inhaler with spacer, and oxygen to target SpO2.
- Reassess SpO2, respiratory rate, breath sounds, speech, peak flow and level of consciousness after each treatment.
- Give the prescribed systemic corticosteroid.
- Prepare for ABG, IV magnesium and intubation if the chest becomes silent, the client becomes drowsy or PaCO2 rises.
Numbers to know
| Value | Range | Why it matters |
|---|---|---|
| Peak flow green zone | 80% to 100% of personal best | Controlled; continue daily plan |
| Peak flow yellow zone | 50% to 79% | Use reliever per action plan |
| Peak flow red zone | Below 50% | Use reliever and get emergency care |
| SpO2 target (adult) | 93% to 96% | Avoids hypoxemia and excess oxygen |
| PaCO2 | 35 to 45 mm Hg (4.7 to 6.0 kPa) | Normal or rising value in distress means fatigue |
| Rescue inhaler use | More than 2 days a week | Asthma is not well controlled |
Common exam traps
- Choosing "treatment is working" when wheezing disappears in a drowsy client: wrong because a silent chest means air flow has nearly stopped.
- Choosing salmeterol or montelukast for acute wheezing: wrong because neither relieves acute bronchospasm.
- Choosing a sedative for an anxious client in an attack: wrong because it depresses respiration.
- Choosing to stop prednisone once wheezing resolves: wrong because the full prescribed course is completed to prevent a relapse.
What to teach
- Use the controller every day even when well; carry the reliever named in the action plan at all times.
- Use a spacer with the metered-dose inhaler; rinse the mouth after inhaled corticosteroids.
- Check peak flow and follow the zones of the written action plan.
- Reduce triggers: allergen-proof mattress and pillow covers, wash bedding in hot water, keep indoor humidity 30% to 50%, avoid smoke.
Client handout: Asthma: Inhalers and Your Action Plan (nurse guide and printable patient handout).
Try 2 NCLEX-style questions on this topic
From the NCLEXPace question bank. Pick your answers, then check them inside NCLEXPace.
A client with severe asthma received repeated bronchodilator treatments. The nurse notes the wheezing is now absent, breath sounds are barely audible, the client is drowsy, and SpO2 is 86% on oxygen. How should the nurse interpret this change?
Select the best answer.
- A. The bronchodilator treatment is working because wheezing has decreased despite persistent low oxygen saturation
- B. The client is fatigued from repeated treatments but remains stable because wheezing is no longer audible
- C. The oxygen flow should be reduced briefly to determine whether the low saturation reflects excessive oxygen delivery
- D. The client is showing signs of respiratory exhaustion and impending ventilatory failure
The nurse reviews an asthma self-management plan with a client.
For each medication plan, identify whether it is appropriate or requires correction.
| Appropriate | Requires correction | |
|---|---|---|
| Use the prescribed short-acting beta₂-agonist for acute bronchospasm | ||
| Use the inhaled corticosteroid consistently for long-term inflammation control | ||
| Replace the rescue inhaler with a scheduled leukotriene modifier during an acute attack | ||
| Rinse the mouth after completing doses from a corticosteroid inhaler | ||
| Use a spacer when coordination with the metered-dose inhaler is difficult |
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- Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Obstructive Pulmonary Diseases.
- Expert Panel Working Group of the National Heart, Lung, and Blood Institute. 2020 Focused Updates to the Asthma Management Guidelines. J Allergy Clin Immunol. 2020;146(6):1217-1270.
- Global Initiative for Asthma. Global Strategy for Asthma Management and Prevention, 2024 Update. GINA; 2024.
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