Respiratory system impedance with impulse oscillometry in healthy and COPD subjects: ECLIPSE baseline results
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Keywords
Impulse oscillometry
ECLIPSE
Respiratory system impedance
Chronic obstructive pulmonary disease
Respiratory reactance
Abbreviations
COPD
chronic obstructive pulmonary disease
GOLD
Global Initiative for Chronic Obstructive Lung Disease
IOS
impulse oscillometry
CT
computed tomography
FEV1
forced expired volume in 1 s
SVC
slow vital capacity
FVC
forced vital capacity
FRC
functional residual capacity
R5, R15 and R20
respiratory resistance (Rrs) at 5 Hz, 15 Hz, and 20 Hz, respectively
R5 − R20
difference in respiratory resistance at 5 Hz and 20 Hz
AX
integrated area of low-frequency reactance
CV
coefficient of variation
X5
reactance at 5 Hz
FRes
resonant frequency
LAA%
percentage of low attenuation areas (i.e. below −950 Hounsfields Units) on chest computed tomography
BMI
body mass index
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Copyright © 2011 Published by Elsevier Ltd.