What are characteristics of stage 4 status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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This is a very serious stage in which the PO2 is low and the PCO2 is high, signifying respiratory failure. These patients have less than 20% of predicted lung function or FEV1 and require intubation and mechanical ventilation.

Patients in stage 4 should be admitted to an ICU. Switching from inhaled beta2-agonists and anticholinergics to metered-dose inhalers (MDIs) via mechanical ventilator tubing is indicated. Parenteral corticosteroids are essential, and theophylline may be added, as with patients in stage 3.

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