Identifying poorer asthma control using oscillometry ratios

Abstract

The presence of airflow obstruction as a forced expiratory volume in 1 second (FEV1)/forced vital capacity (FVC) ratio <0.70 has been shown to identify patients with asthma who have worse small airways dysfunction defined by the forced oscillation technique (FOT).1 Moreover, the combination of FOT and spirometry identifies patients with asthma with worse symptom control and clinically relevant exacerbations.2 FOT is an effort-independent test performed by superimposing sound waves on top of normal tidal breathing to measure respiratory impedance and has established biological variability values in asthma.

Topics & Concepts