I Say IOS You Say AOS: Comparative Bias in Respiratory Impedance Measurements

• DOI: 10.1007/s00408-019-00247-y
• Publication Date: 2019-07-04T14:42:00Z
• Authors: Chris RuiWen Kuo; Sunny Jabbal; Brian Lipworth
• Keywords: Reactance; Spirometer

The forced oscillation technique (FOT) measures respiratory impedance during normal tidal breathing and requires minimal patient cooperation.To compare IOS AOS devices in patients with asthma COPD.We compared two different FOT devices, namely impulse oscillometry using a loudspeaker (IOS: Jaeger Masterscreen) airwave vibrating mesh (AOS: Thorasys Tremoflo) for pre- post-bronchodilator measurements 84 COPD.The overall pattern of measurement bias was higher resistance reactance AOS, this being the case COPD separately. There were small but significantly values at 5 Hz (R5) 20(19) (R20(19)). In converse, (X5), area (AX) resonant frequency (Fres) to much larger extent. difference AX between more pronounced than asthma. Salbutamol reversibility as % change greater not FEV1.Our study showed evidence better agreement when comparing perhaps inferring that may be sensitive measuring airflow obstruction.