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Am. J. Respir. Crit. Care Med., Volume 159, Number 6, June 1999, 1810-1813

Exhaled Nitric Oxide as a Noninvasive Assessment of Chronic Cough

JOSE M. CHATKIN, KHALIL ANSARIN, PHILIP E. SILKOFF, PATRICIA MCCLEAN, CARLOS GUTIERREZ, NOE ZAMEL, and KENNETH R. CHAPMAN

Divisions of Respiratory Medicine, University of Toronto, Toronto, Canada; Catholic University of Rio Grande do Sul, Porto Alegre, Brazil; and Tabriz University of Medical Sciences, Tabriz, Iran

Exhaled nitric oxide (ENO) has been suggested as a marker of airway inflammation. This study aimed to evaluate the role of ENO in the investigation of chronic cough. We measured ENO in 38 adult patients reporting chronic cough, in 23 healthy control subjects, and in 44 asthmatics. In addition to the regular investigation, ENO was measured by a chemiluminescent analyzer using the restricted breath technique. In the chronic cough group, 30 were considered as nonasthmatic, whereas asthma was diagnosed in eight by a positive methacholine challenge. ENO values were significantly higher in patients with chronic cough attributable to asthma as compared with those with chronic cough not attributable to asthma and to healthy volunteers (75.0 ppb; 16.7 ppb; and 28.3 ppb, respectively). The sensitivity and specificity of ENO for detecting asthma, using 30 ppb as the ENO cutoff point, were 75 and 87%, respectively. The positive and negative predictive values were 60 and 93%, and the positive and negative likelihood ratios were 5.8 and 0.3, respectively. We conclude that ENO may have a role in the evaluation of chronic cough. In this group of patients, low ENO suggested little likelihood of asthma. The patients with chronic cough not attributable to asthma showed a low ENO value as compared with healthy volunteers and asthmatics.




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