What is the role of peak flow rate in the evaluation of status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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The peak flow rate is a standard measure of airflow obstruction and is relatively simple to perform. Most patients with more than a mild exacerbation of asthma have hypoxia and decreased oxygen saturation due to V/Q mismatch. Oxygen saturation may increase following the use of bronchodilators secondary to an increase in V/Q mismatch. Some patients prefer to remain seated and leaning forward, rather than assuming a supine position.

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