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Low diagnostic value of respiratory impedance measurements in children
C E Cuijpers1, G J Wesseling, A G Kessels
1Dept of Epidemiology, University of Maastricht, The Netherlands.
Insights
Respiratory impedance testing in children revealed subtle differences in girls with asthma-like symptoms but not in boys or those with chronic cough. The study found low diagnostic value for impedance parameters in identifying respiratory issues in children.
Area of Science:
- Pediatric Respiratory Medicine
- Pulmonary Function Testing
Background:
- Chronic respiratory complaints are common in children.
- Assessing respiratory function in children can be challenging.
- The forced oscillation technique (FOT) offers a non-invasive method to evaluate respiratory impedance.
Purpose of the Study:
- To investigate differences in respiratory impedance values between symptomatic and asymptomatic children.
- To evaluate the diagnostic utility of various respiratory impedance parameters.
- To explore potential sex-based differences in respiratory impedance measurements.
Main Methods:
- Respiratory impedance was measured using the forced oscillation technique (FOT) in 1,776 Dutch children aged 6-12 years.
- Analysis included standard resistance and reactance, alongside parameters derived from linear and quadratic regression of impedance curves.
- Receiver operator characteristic (ROC) curves were used to assess the diagnostic value of individual impedance parameters.
Main Results:
- Statistically significant differences in impedance values were observed in girls with asthma-suggestive symptoms compared to symptom-free girls, but not in boys.
- No significant differences in impedance were found in children with chronic cough compared to symptom-free children.
- Additional impedance parameters yielded results comparable to standard measures, with low overall diagnostic value.
Conclusions:
- Respiratory impedance parameters showed limited ability to clearly discriminate between symptomatic and symptom-free children.
- The findings suggest a potential absence of significant functional abnormalities in symptomatic children of this age group.
- Further research may be needed to refine FOT applications in pediatric respiratory diagnostics.
Abstract:
The aim of this study was to determine whether impedance values in children with various chronic respiratory complaints differed from those observed in symptom-free children. Respiratory impedance was measured using the forced oscillation technique in 1,776 Dutch children aged 6-12 yrs. In addition to the commonly used parameters of resistance and reactance, further impedance parameters were obtained by using linear and quadratic regression to describe individual resistance and reactance curves as a function of frequency. Furthermore, the diagnostic value of the individual impedance parameters was evaluated by means of receiver operator characteristic (ROC) curves. Statistically significant differences in impedance values were found in girls with symptoms suggesting asthma compared to symptom-free girls, but not in boys. In children with chronic cough, impedance was not significantly different from the values of symptom-free children. The results obtained by the additional impedance parameters were comparable to those of the commonly used measures. We conclude that the diagnostic values of the impedance parameters appeared to be low, as no cut-off points were found to discriminate clearly between symptomatic and symptom-free children. These findings may reflect absence of functional abnormalities in symptomatic children at this age.