Impulse Oscillometry in COPD Exacerbation

Impulse Oscillometry (IOS) is a simple, non-invasive, effort-independent method that uses sound waves to detect airway changes quickly. It only requires the patient to breathe normally to assess lung function by measuring both resistance and reactance of the airways. 6,7 These features of IOS suggest it may be a useful test for assessing patient respiratory function during exacerbation periods when airway resistance, airflow limitation, and respiratory muscle weakness further impair breathing.