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Differential diagnostic value of fractional exhaled nitric oxide combined with small airway function tests in children with chronic cough caused by cough variant asthma and post-infectious cough |
ZUO Danhua WANG Dan SHAO Nan▲ JIANG Lijun |
Department of Pediatrics, Affiliated Hospital of Yangzhou University, Jiangsu Province, Yangzhou 225000, China
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Abstract Objective To explore the differential diagnostic value of fractional exhaled nitric oxide (FeNO) combined with small airway function tests in children with chronic cough caused by cough variant asthma (CVA) and post-infectious cough. Methods A total of 89 children with chronic cough who were admitted to the Affiliated Hospital of Yangzhou University from May 2018 to July 2021 were selected as study object, they were divided into CVA group (34 cases) and post-infection cough group (55 cases) according to different etiologies. The FeNO concentration and small airway function (forced expiratory volume in the first second [FEV1], forced expiratory flow at 50% vital capacity [FEF50], forced vital capacity [FVC], maximum mid-expiratory flow 75/25 [MMEF75/25]) of two groups were compared on the 1st day of admission. The influencing factors of CVA-induced chronic cough were analyzed. Results There were no significant difference in age, sex, cough time, lymphocyte fraction, neutrophil fraction, daytime cough symptom score, and nighttime cough symptom score between two groups (P>0.05). FeNO concentration in CVA group was higher than that in post-infection cough group, FEF50 and MMEF75/25 were lower than those in post-infection cough group, and the differences were statistically significant (P<0.05); there were no significant differences in FEV1 and FVC between two groups (P>0.05). FeNO concentration, MMEF75/25, and FEF50 were the influencing factors of CVA-induced chronic cough (OR>1, P<0.05). The area under the curve of FeNO combined with FEF50 and MMEF75/25 was 0.894, the sensitivity was 88.24%, and the specificity was 87.27%. Conclusion FeNO, MMEF75/25,and FEF50 have certain value in the differential diagnosis of CVA-induced chronic cough.
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