How can acute dyspnea affect the accuracy of oscillometry testing for status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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Careful attention must be paid to whether patients have their lips fully closed around the mouthpiece. Patients with acute dyspnea may feel constrained when breathing through a mouthpiece and may reflexively open their mouths to increase airflow during late inspiration. This is analogous to flaring alae nasi with dyspnea and results in characteristic airflow leak patterns. This causes underestimation of true airflow resistance. IOS tests with such airflow leak patterns must be repeated after reassuring the patient and ensuring closure of the lips around the mouthpiece.

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