Journal List > Allergy Asthma Respir Dis > v.3(6) > 1059142

Park, Lee, Yang, Yoon, Cho, Hong, and Yu: Exhaled nitric oxide and bronchial hyperresponsiveness in atopic asthmatic children with and without allergic rhinitis

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 (FEF25%-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, FEF25%-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.

Figures and Tables

Fig. 1

Venn diagram of study subjects.

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Table 1

Baseline characteristics of study participants

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Characteristic NAC AR Atopic asthma without AR Atopic asthma+AR
No. of patients 43 (25.4) 38 (22.5) 19 (11.2) 69 (40.8)
Sex
 Male:female 25:18 25:13 10:09 47:22
Age (mo) 108.6 ± 34.5 126.26 ± 38.2 86.89 ± 27.2 105.71 ± 38.9
Height (cm) 135.21 ± 17.8 143.13 ± 19.71 121.79 ± 15.25§ 131.62 ± 19.01
Weight (kg) 33.51 ± 12.7 41.76 ± 18.1 26.42 ± 12.3 32.29 ± 15.1
Blood eosinophil (%)* 2.43 (1.27-4.64) 3.34 (1.66-6.71) 4.63 (2.25-9.55) 5.29 (2.46-11.37)‡¶
Total IgE (IU/mL)* 48.89 (15.46-154.56) 163.09 (53.32-498.82) 195.34 (60.34-632.42) 418.45 (161.76-1,082.46)§¶**
SOW/H* 0.74 (0.64-0.86) 3.66 (2.37-5.65) 3.31 (2.08-5.28) 3.71 (2.51-5.5)
Asthma severity
 Mild intermittent - - 16 (84.2) 52 (75.4)
 Mild persistent - - 2 (10.5) 6 (8.7)
 Moderate persistent - - 1 (5.3) 10 (14.5)
 Severe persistent - - 0 (0.0) 1 (1.4)
Inhaled steroid use - - - -
 None - - 12 (63.2) 32 (46.4)
 Any use - - 7 (36.8) 37 (53.6)
Systemic steroid use - -
 None - - 18 (94.7) 67 (97.1)
 Any use - - 1 (5.3) 2 (2.9)

Values are presented as number (%), mean±standard deviation (SD), or geometric mean (range of 1SD).

NAC, nonatopic control; AR, allergic rhinitis; SOW/H, sum of wheal size in each allergen/histamine wheal size.

*P-values were adjusted for weight and for multiple comparisons by Bonferroni. P<0.01, compared to AR group. P<0.05, compared to AR group. §P<0.001, compared to AR group. P<0.05, compared to NAC group. P<0.001, compared to NAC group. **P<0.05, compared to atopic asthma without AR group.

Table 2

Lung function, bronchial hyperresponsiveness, and exhaled nitric oxide among the study groups

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Variable NAC AR Atopic asthma without AR Atopic asthma+AR
No. of patients 43 (25.4) 38 (22.5) 19 (11.2) 69 (40.8)
FEV1 (%predicted) 106.81 ± 13.6 110.6 ± 11.1 100.62 ± 12.1 98.11 ± 12.7‡§
FVC (% predicted) 104.52 ± 13.2 108.61 ± 10.9 100.99 ± 16.2 102.38 ± 13.2
FEF25%-75% (% predicted) 110.1 ± 23.7 112.76 ± 25.7 92.89 ± 20.8∥† 85.98 ± 22.1§¶
DRS methacholine* 0.62 ± 0.15 0.62 ± 0.12 1.02 ± 0.35§¶ 1.04 ± 0.37§¶
DRS AMP* 0.51 ± 0.01 0.52 ± 0.01 0.72 ± 0.18†‡ 0.72 ± 0.27§¶
eNO (ppb)* 10.81 (6.26-18.67) 16.87 (8.74-32.55) 17.5 (9.38-32.63) 28.53 (14.84-54.86)§¶**

Values are presented as number (%), mean±standard deviation (SD), or geometric mean (range of 1SD).

NAC, nonatopic control; AR, allergic rhinitis; FEV1, forced expiratory volume in one second; FVC, functional vital capacity; FEF25%-75%, forced expiratory flow during 25%-75%; DRS, dose-response slope; AMP, adenosine 5'-monophosphate; eNO, exhaled nitric oxide.

*P-values were adjusted for weight and for multiple comparisons by Bonferroni. P<0.05, compared to AR group. P<0.01, compared to NAC group. §P<0.001, compared to AR group. P<0.05, compared to NAC group. P<0.001, compared to NAC group. **P<0.05, compared to atopic asthma without AR group.

Table 3

Correlation between lung function, bronchial hyperresponsiveness, and exhaled nitric oxide in subjects with atopic asthma

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Variable FEV1 (%predicted) FEF25%-75% (%predicted) DRS methacholine DRS AMP eNO Total IgE SOW/H
FEF25%-75% 0.663*** - - - - - -
DRS methacholine -0.397*** -0.398*** - - - - -
DRS AMP -0.33*** -0.308** 0.667*** - - - -
eNO -0.277** -0.286** 0.338*** 0.365*** - - -
Total IgE -0.209* -0.122 0.168 0.146 0.479*** - -
SOW/H 0.094 0.100 0.116 0.281** 0.317*** 0.358*** -

Data are correlation coefficient (Pearson r) with controls for weight.

FEV1, forced expiratory volume in one second; FVC, functional vital capacity; FEF25%-75%, forced expiratory flow during 25%-75%; DRS, dose-response slope; AMP, adenosine 5'-monophosphate; eNO, exhaled nitric oxide; SOW/H, sum of wheal size in each allergen/histamine wheal size.

*P<0.05. **P<0.01. ***P<0.001.

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Supplementary Material

Supplement Table 1

Lung function, bronchial hyperresponsiveness, and exhaled nitric oxide among the study groups after correction with IgE
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ORCID iDs

Jinho Yu
https://orcid.org/http://orcid.org/0000-0002-1226-8077

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