Allergy Asthma Respir Dis.  2015 Nov;3(6):425-431. 10.4168/aard.2015.3.6.425.

Exhaled nitric oxide and bronchial hyperresponsiveness in atopic asthmatic children with and without allergic rhinitis

Affiliations
  • 1Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. jyu3922@gmail.com
  • 2Department of Pediatrics, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.

Abstract

PURPOSE
Children with asthma frequently have allergic rhinitis (AR) as a comorbidity. Asthmatic children with AR have a higher exhaled nitric oxide (eNO) level and bronchial hyperresponsiveness (BHR) than those without. The purpose of this study is to investigate the difference in lung function, eNO, and BHR between atopic asthma with and without AR, and the association of eNO and BHR with atopic intensity in total asthmatics.
METHODS
We recruited 69 atopic asthmatic children with AR, 19 atopic asthmatic children without AR, 38 children with AR, and 43 nonatopic controls. We measured forced expiratory volume in one second (FEV1) and forced expiratory flow at 25% to 75% of forced vital capacity (FEF(25%-75%)), dose response slope (DRS) of bronchial challenge with methacholine and adenosine 5'-monophosphate (AMP), the levels of eNO, and the ratio of sum of allergen wheal diameter to histamine using skin prick tests.
RESULTS
Atopic asthmatic children with AR had a higher eNO level compared to those without AR (P<0.05). However, there was no difference in FEV1 %predicted, FEF(25%-75%) %predicted, methacholine DRS, and AMP DRS between asthmatic children with and without AR. In total asthmatics, methacholine DRS and AMP DRS significantly correlated with eNO levels (r=0.338, P<0.001; r=0.365, P<0.001), but not with total IgE levels. However, eNO significantly correlated with total IgE levels (r=0.479, P<0.001).
CONCLUSION
These results suggest that AR may enhance airway inflammation but may not lead to enhanced BHR in children with asthma.

Keyword

Asthma; Allergic rhinitis; Comorbidity; Bronchial hyperreactivity; Exhaled nitric oxide

MeSH Terms

Adenosine
Asthma
Bronchial Hyperreactivity
Child*
Comorbidity
Forced Expiratory Volume
Histamine
Humans
Immunoglobulin E
Inflammation
Lung
Methacholine Chloride
Nitric Oxide*
Rhinitis*
Skin
Vital Capacity
Adenosine
Histamine
Immunoglobulin E
Methacholine Chloride
Nitric Oxide

Figure

  • Fig. 1 Venn diagram of study subjects.


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