Initial Treatment for Asthma Exacerbation

Primary Treatment Components

The American College of Chest Physicians recommends administering oxygen through nasal cannulae or mask to maintain oxygen saturation >90% (>95% in pregnant patients or those with heart disease) 1, 2
The American Thoracic Society suggests monitoring oxygen saturation continuously until a clear response to bronchodilator therapy has occurred 1
Albuterol (short-acting beta-agonist) is the first-line treatment for all asthma exacerbations, with dosing options including 2.5-5 mg every 20 minutes for 3 doses, then 2.5-10 mg every 1-4 hours as needed via nebulizer, or 4-8 puffs every 20 minutes for up to 3 doses, then as needed via MDI with spacer 1, 2
For severe exacerbations (FEV1 or PEF <40%), continuous administration of albuterol may be more effective 2
Systemic corticosteroids should be administered early in the treatment, with oral prednisone 40-60 mg in single or divided doses for adults, and 1-2 mg/kg/day (maximum 60 mg/day) for children 1, 2

The American Academy of Allergy, Asthma, and Immunology recommends adding ipratropium bromide to beta-agonist therapy for severe exacerbations, with dosing of 0.5 mg via nebulizer or 8 puffs via MDI every 20 minutes for 3 doses, then as needed 1, 2
Consider intravenous magnesium sulfate (2g IV over 20 minutes) for patients with severe refractory asthma, as it is most effective when administered early in the treatment course 1, 2

Assess severity based on symptoms, signs, and lung function (PEF or FEV1), with mild exacerbation defined as dyspnea only with activity, PEF ≥70% of predicted/personal best, moderate exacerbation as dyspnea interfering with usual activity, PEF 40-69% of predicted, and severe exacerbation as dyspnea at rest, PEF <40% of predicted 1, 2
Reassess the patient 15-30 minutes after starting treatment, measuring PEF or FEV₁ before and after treatments, and assessing symptoms and vital signs 1, 2
Response to treatment is a better predictor of hospitalization need than initial severity 1, 2

Regular use of short-acting beta agonists (four or more times daily) can reduce the duration of action, according to the American Academy of Family Physicians 3
Monitor for signs of impending respiratory failure: inability to speak, altered mental status, intercostal retraction, worsening fatigue 1
Avoid sedatives of any kind in patients with acute asthma exacerbation, as recommended by the American College of Chest Physicians 2

For severe exacerbations (FEV1 or PEF <40%), continuous administration of albuterol may be more effective than intermittent administration, as recommended by the American Academy of Allergy, Asthma, and Immunology 4

EMS providers should administer supplemental oxygen and inhaled short-acting bronchodilators, such as albuterol, and treatment can be repeated while transporting the patient to a maximum of 3 bronchodilator treatments during the first hour and then 1 per hour, according to the American Academy of Allergy, Asthma, and Immunology 4