Management of Severe Asthma Unresponsive to Standard Therapy

Immediate Management Steps

Consider adding ipratropium bromide to the nebulized β2-agonist therapy to increase bronchodilation in severe exacerbations, according to the guidelines from Praxis Medical Insights 1
Continue high-flow oxygen therapy via face mask to maintain SaO₂ >90% (>95% in pregnant women and patients with heart disease), as recommended by Praxis Medical Insights 1
Increase the frequency of nebulized β-agonist treatments up to every 30 minutes if the patient is not improving, as suggested by Thorax 2, 3

Consider IV aminophylline (5 mg/kg over 20 minutes followed by maintenance infusion of 1 mg/kg/h); omit the loading dose if the patient is already receiving oral theophyllines, according to Thorax 2, 4
Alternatively, consider IV terbutaline (250 μg over 10 minutes), as recommended by Thorax 3

Continuously monitor vital signs, oxygen saturation, and peak expiratory flow (PEF), as suggested by Thorax 2
Arrange for chest radiography to exclude pneumothorax, consolidation, or pulmonary edema, according to Thorax 3
Check plasma electrolytes, urea concentrations, and blood count, as recommended by Thorax 3
Assess for signs of deterioration requiring intensive care: worsening PEF, persistent hypoxia despite oxygen therapy, exhaustion, feeble respirations, confusion, or drowsiness, as suggested by Thorax 5

Transfer to intensive care unit accompanied by a doctor prepared to intubate if there is: deteriorating PEF or worsening exhaustion, feeble respirations, persistent hypoxia or hypercapnia, according to Thorax 5
Coma or respiratory arrest, confusion, or drowsiness, as recommended by Thorax 5

Consider intermittent positive pressure ventilation for patients with: worsening hypoxia or hypercapnia despite maximal therapy, as suggested by Thorax 3
Drowsiness or unconsciousness, according to Thorax 3
Respiratory arrest, as recommended by Thorax 3

Avoid sedation as it is contraindicated in severe asthma, according to Thorax 3
Antibiotics should only be given if bacterial infection is present, as suggested by Thorax 3
Percussive physiotherapy is unnecessary in acute severe asthma, according to Thorax 3
The anti-inflammatory effects of corticosteroids may not be apparent for 6-12 hours after administration, making early and aggressive intervention critical, as recommended by Praxis Medical Insights 1

Patients should not be discharged until symptoms have stabilized with PEF >75% of predicted value, according to Thorax 3, 5
Ensure patients have been on discharge medication for at least 24 hours with inhaler technique checked and recorded, as suggested by Thorax 2, 5
Provide oral prednisone for 1-3 weeks after discharge, as recommended by Praxis Medical Insights 1
Arrange follow-up with primary care within 1 week and respiratory specialist within 4 weeks, according to Thorax 5

The threshold for ICU admission should be lower in patients seen in the afternoon or evening, those with recent nocturnal symptoms, or those with previous severe attacks, as suggested by Thorax 6