Allergy Asthma Respir Dis.  2015 Jan;3(1):40-46. 10.4168/aard.2015.3.1.40.

Relationships of bronchodilator response with asthma control and fractional exhaled nitric oxide in children with atopic asthma

Affiliations
  • 1Department of Pediatrics, Chungbuk National University College of Medicine, Cheongju, Korea. yshahn@chungbuk.ac.kr
  • 2Department of Preventive Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.

Abstract

PURPOSE
Because bronchodilator response (BDR) is variable among asthmatic patients, there are practical limitations in using BDR to assess asthma control. We investigated the relationships of BDR with asthma control status and fractional exhaled nitric oxide (FeNO) in children with atopic asthma.
METHODS
One hundred ninety-one patients aged 8 to 16 years with atopic asthma were enrolled. Pulmonary function tests including BDR and FeNO were serially measured 10 times or more over 2 years when subjects were not receiving controller medications. During the last year of follow-up, the loss of asthma control was assessed in all participants.
RESULTS
We identified 114 children (60%) with at least 1 positive BDR (> or =12%) over the 2-year observation period. Higher levels of BDRs and higher rates of positive BDRs were associated with lower lung function and lower methacholine PC20 (provocative concentration of methacholine causing a 20% fall in forced expiratory volume in one second). The loss of asthma control occurred in 106 of individuals (93%) who had positive BDRs, as compared to 52 of 77 (68%) with negative BDRs (P<0.001). There was no difference in FeNO levels between individuals with positive and negative BDRs. However, among children with negative BDRs, those developing the loss of asthma control had higher maximal FeNO levels and higher rates of FeNO>21 parts per billion than those who maintained asthma control (all P<0.001).
CONCLUSION
Positive BDRs are linked to a higher probability of asthma control loss in children with atopic asthma. In addition, high FeNO is associated with asthma control loss in asthmatic children with negative BDRs.

Keyword

Asthma; Child; Lung function; FeNO

MeSH Terms

Asthma*
Child*
Follow-Up Studies
Forced Expiratory Volume
Humans
Lung
Methacholine Chloride
Nitric Oxide*
Respiratory Function Tests
Methacholine Chloride
Nitric Oxide

Figure

  • Fig. 1 Study schedule. BDR, bronchodilator response; FeNO, fractional exhaled nitric oxide; PC20, provocative concentration of methacholine causing a 20% fall in forced expiratory volume in one second.

  • Fig. 2 Comparison of number of individuals developing loss of asthma control (A) and number of asthma control loss per year (B) between groups with positive and negative bronchodilator responses (BDRs).


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