A Comparison of Spirometry Versus Impulse Oscillometry in Patients  with Asthma Based on Asthma Severity

Maryam  Heydarazad zadeh; Seyed Alireza  Mahdaviani; Alireza  Eslaminejad; Mahsa  Rekabi

doi:10.18502/ijaai.v24i3.18678

Maryam Heydarazad zadeh Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Seyed Alireza Mahdaviani Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Alireza Eslaminejad Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mahsa Rekabi Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran

DOI: https://doi.org/10.18502/ijaai.v24i3.18678

Keywords: Asthma; Impulse oscillometry; Spirometry

Abstract

Measuring the performance of small airways dysfunction is challenging due to their relative inaccessibility with conventional methods. In recent years, spirometry and impulse oscillometry (IOS) methods have been widely used for their evaluation. The aim of this study was to investigate the relationship between spirometric parameters and IOS in newly diagnosed asthma (NDA) patients.

In this cross-sectional study, 100 NDA patients who referred to the allergy Clinic of Masih Daneshvari Hospital between 2021 and 2023 were enrolled. IOS and spirometry tests were performed for all patients. Spirometry measures included forced vital capacity (FVC), forced expiratory volume in the first second (FEV1), FEV1/FVC, and forced expiratory flow (FEF25-75). IOS criteria included R5%, R20%, R5-R20%, X5%, Ax% and FRES. The relationship between spirometry and IOS parameters was evaluated.

The mean age was 22.6±9.5 years. None of the 2 techniques had a significant relationship with disease severity. FVC, FEV1/FVC and FEF25-75 indices had a significant positive correlation with all other IOS indices except for Ax. In the comparison of FEF25-75 parameter in spirometry, 4 IOS indices including R5, R20, R5-R20 and X5 had appropriate sensitivity and specificity for predicting asthma. In the comparison of FEF25-75 parameter in spirometry, 4 IOS indices including R5, R20, R5-R20 and X5 had appropriate sensitivity and specificity for predicting asthma. The sensitivity and specificity of R5 for asthma diagnosis were 0.85 and 0.73, respectively.

Further multicenter studies with larger sample sizes are recommended to confirm these results.