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Exhaled nitric oxide continues to reflect airway hyperresponsiveness and disease activity in inhaled corticosteroid-treated adult asthmatic patients

Citation

Reid, DW and Johns, DP and Feltis, B and Ward, C and Walters, EH, Exhaled nitric oxide continues to reflect airway hyperresponsiveness and disease activity in inhaled corticosteroid-treated adult asthmatic patients, Respirology, 8, (4) pp. 479-486. ISSN 1323-7799 (2003) [Refereed Article]

DOI: doi:10.1046/j.1440-1843.2003.00495.x

Abstract

Objective: Exhaled nitric oxide (eNO) has been used as a surrogate of airway inflammation in mild asthma. However, whether eNO levels reflect disease activity in symptomatic asthmatics receiving moderate doses of inhaled corticosteroid (ICS) is more uncertain. Methodology: To examine the relationship between eNO levels, sputum and blood eosinophils (SpE and PbE), PD20 methacholine as a marker of airway hyperresponsiveness (AHR) and clinical status in 28 ICS-treated asthmatic subjects with persistent asthma compared to that in 25 symptomatic asthmatics managed with β 2-agonists alone. Results: As expected, eNO levels were normalized in ICS-treated subjects and significantly elevated in the β 2-agonist only group (P < 0.001). SpE, PbE and PD20m did not differ between asthmatic groups but FEV1 was significantly worse in ICS-treated subjects (P < 0.01). Exhaled NO levels correlated with PbE within both asthmatic groups (P < 0.005), but with SpE only in ICS-untreated subjects (r(s) = 0.6, P < 0.05). In contrast, PD20M was negatively correlated with eNO and PbE in ICS-treated subjects only (r(s) = -0.4, r(s) = -0.4, respectively, P < 0.05). SpE and PbE were strongly correlated in both asthmatic groups (r(s) = 0.8, r(s) 0.7, respectively, P < 0.005). Exhaled NO levels, SpE and PbE were all positively associated with increased nocturnal awakenings (P < 0.05) in ICS-treated subjects, but not in ICS-untreated subjects. Conclusions: In ICS-treated asthma, eNO reflects clinical activity, PbE and AHR but not eosinophilic airway inflammation. Exhaled NO levels are quantitatively and relationally different in asthmatic subjects treated with ICS and continue to have potential for use as a surrogate of asthma pathophysiology in this group.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Respiratory Diseases
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Respiratory System and Diseases (incl. Asthma)
Author:Reid, DW (Dr David Reid)
Author:Johns, DP (Associate Professor David Johns)
Author:Walters, EH (Professor Haydn Walters)
ID Code:27207
Year Published:2003
Web of Science® Times Cited:17
Deposited By:Medicine (Discipline)
Deposited On:2003-08-01
Last Modified:2004-03-22
Downloads:0

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