Tidal breathing nasal nitric oxide in preschool children aged 3 to 5 years / 中华实用儿科临床杂志

ABSTRACT

Objective:To explore the threshold of tidal breathing nasal nitric oxide (TB-nNO) in diagnosing primary ciliary dyskinesia (PCD) in children aged 3 to 5 years.Methods:Retrospective study.The TB-nNO values were examined of 165 healthy children aged 3-5 in a kindergarten in Xicheng District, Beijing, from March 27 to March 29, 2018, which were also measured in children aged 3-5 years who were diagnosed as PCD, cystic fibrosis, bronchiolitis obliterans, bronchiectasis caused by other diseases and asthma in the Second Department of Pediatric Pneumology, Beijing Children′s Hospital, Capital Medical University from January 2018 to December 2021.Relevant factors associated with TB-nNO in normal children were screened by a multiple linear regression model.The cut-off value of TB-nNO in diagnosing PCD in preschool children aged 3-5 years was determined by calculating the maximum area under the receiver operating characteristic (ROC) curve.Results:TB-nNO value in healthy children aged 3, 4 and 5 years were (94.8±36.4) nL/min, (103.3±50.7) nL/min and (106.9±61.5) nL/min, respectively.The mean TB-nNO value in 9 children with PCD was (18.9±10.8) nL/min.TB-nNO values in 49 children with asthma, 19 children with bronchiolitis obliterans, 17 children with bronchiectasis and 6 children with cystic fibrosis were (97.7±51.1) nL/min, (93.2±49.2) nL/min, (93.7±75.3) nL/min and (45.4±18.2) nL/min, respectively.Using 30 nL/min of TB-nNO as the cut-off point, the sensitivity and specificity of TB-nNO in diagnosing PCD were 88.9% (8/9) and 96.9%, respectively.The area under the ROC curve was 98.3% (95% CI 95.3%-100.0%). Conclusions:TB-nNO value of 30 nL/min can be used as the cut-off point in the diagnosis screening of PCD in children aged 3-5 years.Its diagnostic value in this age group should be further evaluated.