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Conducting Respiratory Oscillometry in an Outpatient Setting
Published on: April 8, 2022
Methacholine-induced asthma symptoms correlate with impulse oscillometry but not spirometry
Adel H Mansur1, Sarah Manney, Jon G Ayres
1Respiratory Medicine, Birmingham Heartlands Hospital NHS Trust, Birmingham, West Midlands, UK. adel.mansur@heatofengland.nhs.uk
Respiratory Medicine
|September 29, 2007
Summary
Impulse oscillometry (IOS) better correlates with asthma symptoms like dyspnea and chest tightness during methacholine challenge tests compared to spirometry. This suggests IOS may offer a more sensitive measure of airway resistance in asthma patients.
Area of Science:
- Respiratory Medicine
- Pulmonary Physiology
Background:
- Traditional spirometry shows poor correlation with patient-reported asthma symptoms during bronchial provocation.
- Impulse oscillometry (IOS) offers an alternative method for measuring airway resistance, potentially with higher sensitivity.
Purpose of the Study:
- To analyze the relationship between methacholine-induced asthma symptoms and measurements from both IOS and spirometry.
- To determine if IOS is more sensitive than spirometry in reflecting asthma symptom severity.
Main Methods:
- Twenty individuals with stable asthma underwent two methacholine challenge tests.
- Asthma symptoms (dyspnea, tightness, wheeze) were scored using visual analogue scales.
- Airway resistance was measured using IOS (R5, X5) and spirometry (FEV1, MEF50) at incremental methacholine doses.
Main Results:
- Methacholine-induced dyspnea scores significantly correlated with IOS measures R5 (r=0.62) and X5 (r=0.51), but not with spirometry (FEV1, MEF50).
- IOS measure R5 was the only significant predictor of dyspnea variability in regression analysis (p=0.003).
- Chest tightness showed similar correlations to dyspnea, while wheeze correlated with both IOS and spirometry.
Conclusions:
- Airway resistance measured by IOS during methacholine challenge correlates better with asthma symptoms than spirometry.
- IOS demonstrates higher sensitivity in reflecting subjective asthma symptom experience compared to traditional spirometric measures.
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