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Updated: Feb 15, 2026

Conducting Respiratory Oscillometry in an Outpatient Setting
Published on: April 8, 2022
Asthma predictive index in relation to respiratory mechanics by impulse oscillometry in recurrent wheezers
T Arikoglu1, S B Batmaz2, D D Yildirim3
1Mersin University, Faculty of Medicine, Department of Pediatric Allergy and Immunology, Mersin, Turkey.
Insights
Impulse oscillometry (IOS) can help identify preschool children at high risk for persistent asthma. This lung function test shows diagnostic value in predicting the modified Asthma Predictive Index (mAPI) in wheezing preschoolers.
Area of Science:
- Pediatric Pulmonology
- Respiratory Diagnostics
- Asthma Research
Background:
- Identifying children with persistent asthma is crucial.
- Recurrent wheezing in preschoolers requires accurate risk assessment.
- Impulse oscillometry (IOS) is a potential tool for evaluating respiratory function.
Purpose of the Study:
- To evaluate the diagnostic value of impulse oscillometry (IOS).
- To predict the modified Asthma Predictive Index (mAPI) in preschoolers with recurrent wheezing.
- To identify children at high risk for developing persistent asthma.
Main Methods:
- Enrolled preschool children (3-6 years) with recurrent wheezing.
- Classified children into two groups based on mAPI criteria.
- Assessed lung function using impulse oscillometry (IOS).
Main Results:
- 64% of children were mAPI positive; R5-R20% levels were significantly higher in mAPI-positive children.
- R5-R20% levels correlated with parental asthma and inhalant sensitization.
- R5-R20% >14.4 showed 75% sensitivity and 53% specificity for predicting positive mAPI.
Conclusions:
- Impulse oscillometry (IOS) demonstrates diagnostic value in predicting mAPI.
- IOS can aid clinicians in identifying high-risk preschool wheezers.
- This supports the use of IOS for early asthma risk assessment in children.
Background:
The identification of children who will have persistent asthma has become a focus of recent research. The aim of this study was to assess whether impulse oscillometry (IOS) has a diagnostic value to predict modified API (asthma predictive index) in pre-schoolers with recurrent wheezing.
Methods:
Pre-school children aged 3-6 years with recurrent wheezing were enrolled. The study population was divided into two groups based on mAPI criteria. Lung function was assessed by IOS.
Results:
115 children were assessed; 75 (65.2%) of them were male. The median age was 39 months (min: 36, max: 68 months). 64 (55.6%) of the children were mAPI positive. The R5-R20% levels of children with positive mAPI were significantly higher compared to negative mAPI. Also, R5-R20% levels of children with parental asthma and R20% pred and resonant frequency (Fres) levels of children with inhalant sensitization were higher than those without. No significant differences were found in IOS indices between groups based on the presence of atopic dermatitis, food sensitization, eosinophilia, inhaled corticosteroid usage or wheezing without colds. R5-R20% and total IgE values were found to be significantly related to positive mAPI (aOR: 1.40, p=0.022 and aOR: 1.02, p=0.001, respectively). In the ROC analysis, R5-R20% levels >14.4 had a sensitivity of 75% and specificity of 53% for predicting a positive mAPI (p=0.003).
Conclusion:
IOS may help clinicians to identify the pre-school wheezers with a high risk of asthma.
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