Impulse Oscillometry as Predictor of Asthma exacerbation resulting in Emergency Room/Urgent Care visits or Hospitalization: A Retrospective Study

Gauri Kulkarni MBBS

Abstract

The Impulse Oscillometry System is a technique that generates pressure oscillations with low (5Hz) frequency and high (20Hz) frequency signals and delivers it to the respiratory tract1.

Low frequency sound waves reach the peripheral airways with diameter less than 2 mm, while the high frequency sound waves reach the central airways1 Peripheral airways are major sites of obstruction and inflammation, which are not well evaluated by spirometry. IOS which measures airway impedance can differentiate between central and distal obstruction.

IOS could detect distal airway impairment even before clinical manifestations and spirometry abnormalities develop. We analyzed clinical and IOS parameters predicting asthma exacerbation within 1 year of IOS measurement

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