How is oscillation testing performed with an impulse oscillometry system (IOS) to evaluation status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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With forced oscillation testing using the impulse oscillometry system (IOS), patients are tested for 30-40 seconds during quiet breathing, without forced respiratory efforts. A small loudspeaker pushes "burps" of air into patients and pulls them back from the mouthpiece 5 times each second.

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