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Conducting Respiratory Oscillometry in an Outpatient Setting
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Respiratory resistance by impulse oscillometry in healthy Iranian children aged 5-19 years
Babak Amra1, Froogh Soltaninejad, Mohammad Golshan
1Department of Pulmonology, Isfahan University of Medical Sciences, Isfahan, Iran. amra@med.mui.ac.ir
Insights
This study establishes reference values for respiratory impedance in Iranian adolescents using the impulse oscillation system (IOS). The findings provide crucial data for diagnosing and monitoring respiratory conditions in this population.
Area of Science:
- Pulmonary Physiology
- Respiratory Medicine
- Biomedical Engineering
Background:
- Impulse oscillation system (IOS) measures respiratory impedance (Zrs), including resistance (Rrs) and reactance (Xrs), at 5 Hz intervals.
- IOS is valuable for clinical assessment of respiratory disorders, independent of patient effort.
- No established reference values for IOS exist for the Iranian adolescent population.
Purpose of the Study:
- To determine gender-specific predictive equations for respiratory impedance parameters (Rrs and Xrs) in Iranian adolescents.
- To establish a reference frame for IOS measurements in this demographic.
- To facilitate the clinical diagnosis and monitoring of respiratory diseases in Iranian youth.
Main Methods:
- A cross-sectional study involving 509 Iranian adolescents (265 boys, 253 girls) aged 5-19 years.
- Respiratory impedance (R5, R15, R25, X5, X15, X25) was measured using a standardized forced oscillation technique.
- Gender-specific linear prediction equations were developed using multiple regression analysis, with age and height as independent variables.
Main Results:
- Predictive equations for Rrs and Xrs at 5, 15, and 25 Hz were established for both genders.
- Age and height demonstrated a negative correlation with resistance and a positive correlation with reactance in both genders.
- Specific equations for R5 and X5 were provided for girls and boys, respectively.
Conclusions:
- This study provides the first reference values for R5, R15, R25, X5, X15, and X25 in Iranian adolescents.
- The developed predictive equations can aid in the interpretation of IOS measurements in this population.
- These findings support the use of IOS for objective respiratory assessment in Iranian youth.
Abstract:
The impulse oscillation system (IOS) measures respiratory impedance (Zrs) in terms of resistance (Rrs) and reactance (Xrs) at multiples of 5 Hz. These measurements can be used clinically to help diagnose and monitor respiratory disorders, independent of effort. There is, as yet, no information on reference values for IOS in Iranian adolescents.The predictive equation for resistance and impedance at 5 and 15 and 25 Hz, for the first time, in 509 Iranian adolescent subjects (265 boys (aged 6-19 years) and 253 girls (aged 5-19 years) were determined. Gender-specific linear prediction equations were developed by multiple regression analysis; with measuring (R5, R15, R25, X5, X15, X 25) as dependent variables regressed against age (A) and height (H).For both genders, age and height had negative effects on resistance, while age and height had a positive effect on reactance. The prediction equations for R5 and X5 are as follows: R5: -1.35x10(-5) x agex2.823 - 0.001 x height x1.022 + 0.547 for girlsX5: 1.78x10(-7)x age x1.08 + 0.002 height x4.150 - 0.539, for girls R5: -6.19x10(-7)x age x 3.820 - 6.78E-005 x height x1.651 + 0.691 for boysX5: 6.95x10(-23) x age x16.226 + 0.004 height x 0.846- 0.430, for boys, respectively. Our results therefore provide an original frame of reference for R5, R15, R25, X5, X15, X25 in Iranian adolescents population, obtained from a standardized forced oscillation technique.
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