Medical technology and clinical
LIN Jiayuan, LIN Liping, LIU Fangyi, TAO Yinglin, OUYANG Yafang
Objective: To explore the application value of pulse oscillation (IOS) pulmonary function test in the diagnosis of bronchial asthma in preschool children. Method: 102 children with bronchial asthma admitted to Jinjiang Hospital from February 2023 to February 2024 were selected as the bronchial asthma group, and another 60 healthy children who underwent physical examinations during the same period were selected as the control group. IOS lung function tests were performed on all children, and they were divided into three subgroups according to the severity of bronchial asthma: mild group (n=35), moderate group (n=43), and severe group (n=24). The differences in IOS lung function test parameters [impedance at 5 Hz oscillation frequency (R5), impedance at 20 Hz oscillation frequency (R20), airway resistance difference at 5 Hz and 20 Hz oscillation frequency (R5-R20), and total respiratory impedance (Zrs)] were compared among the groups, and the differences were plotted. Receiver operating characteristic (ROC) curve analysis of the diagnostic value of IOS lung function test parameters for bronchial asthma in preschool children was conducted. Result: It is shown that the IOS lung function test parameters R5, R20, R5-R20, and Zrs levels in the bronchial asthma group were higher than those in the control group (P<0.05). The IOS lung function test parameters R5, R20, R5-R20, and Zrs levels in children with severe bronchial asthma were higher than those in the moderate and mild groups, and the IOS lung function test parameters R5, R20, R5-R20, and Zrs levels in children with moderate bronchial asthma were higher than those in the mild group (P<0.05). ROC curve analysis showed that the AUC (95% CI) of IOS lung function test parameters R5, R20, R5-R20, and Zrs for diagnosing bronchial asthma in preschool children were 0.758 (0.683~0.834), 0.842 (0.784~0.901), 0.847 (0.787~0.906), and 0.868 (0.810~0.927), respectively. The sensitivity was 63.7%, 62.7%, 80.4% and 81.4%, and the specificity was 78.3%, 86.7%, 81.7% and 83.3%. Conclusion: IOS lung function test parameters R5, R20, R5-R20, and Zrs have certain diagnostic value for bronchial asthma in preschool children. In clinical practice, the level of IOS lung function test parameters can be comprehensively analyzed to assist in the early diagnosis and treatment of bronchial asthma in preschool children.