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Relationship between exhaled nitric oxide and pulmonary function test in children with asthma

Korean Journal of Pediatrics 2008;51(2):181-187.
Published online February 15, 2008.
Relationship between exhaled nitric oxide and pulmonary function test in children with asthma
Han-Seok Ko1, Sung-Hoon Chung1, Yong-Sung Choi1, Sun-Hee Choi2, Yeong-Ho Rha1
1Department of Pediatrics, College of Medicine, Kyung Hee University, Seoul, Korea
2Department of Pediatrics, East-West Neo-medical Center, Kyung Hee University
소아 천식에서 호기산화질소와 폐기능 검사의 관계
고한석1, 정성훈1, 최용성1, 최선희2, 나영호1
1경희대학교 의과대학 소아과학교실
2경희대학교 동서신의학병원 소아청소년과
Yeong-Ho Rha, Email: yhrha@khu.ac.kr
: Asthma is characterized by reversible airway obstruction and bronchial hyperresponsiveness result from airway inflammation. Fraction of nitric oxide in expired air (FeNO) has recently been investigated as a noninvasive measure of airway inflammation. FeNO has been reported to correlate with induced sputum eosinophilia and methacholine challenge test that it is represent severity of asthma. The purpose of this study was to analyze the relationship of FeNO with pulmonary function tests in patients with intermittent asthma.
: Eighty children included in this study were diagnosed as asthma from April through August, 2005 in Department of Pediatrics, College of Medicine, Kyunghee University. They aged from 4 to 15 years who were able to conduct spirometry and FeNO monitoring. They did not have upper respiratory tract infection and did not use an asthma controller which contain corticosteroids within 4 weeks. Pulmonary function test was done and FeNO was measured with online tidal breathing method using a chemiluminescence NO analyzer (CLD 88 sp, Eco Medics, Duernten, Switzerland). The correlations between pulmonary function test and FeNO were analyzed using Spearman correlation coefficient method.
: The mean of FeNO of subject was 16.88 parts per billion (ppb). The mean of forced expiratory volume in 1 second (FEV1) was 0.890?.455 L and forced vital capacity (FVC) was 1.071?.630 L. The mean of predicted FEV1% (FEV1%pred) was 98.39?4.27% and FEV1/FVC was 88.53?9.49. FeNO was significantly correlate with FEV1 (r=0.345, P<0.01) and FVC (r=0.244, P<0.05). FeNO did not correlate with FEV1%pred or FEV1/FVC.
: The measurement of FeNO could be a useful marker in the management of childhood asthma and it is evolving to provide a complementary role alongside existing pulmonary function test. We propose that measuring technique and establishment of normal reference range are important area for future research.
Key Words: Nitric oxide, Asthma, Spirometry, Child

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