Measurement of exhaled nitric oxide (NO) may allow noninvasive assessment of inflammatory disease in the lung. We determined immediate and day-to-day reproducibility of single-breath NO measurements at different points on the exhaled test, and whether levels recorded reflect levels of NO in the lower airways. Using a rapid chemiluminescence analyser, 55 healthy control subjects performed three ...

Fractional exhaled nitric oxide concentration (FENO) depends on exhalation flow; however, children often are unable to perform controlled flow procedures. Therefore, a device was developed for off-line FENO sampling, with dynamic flow restriction (DFR). The authors compared off-line with on-line FENO, assessed feasibility, and obtained normal values for FENO in children aged 4-8 yrs. Subjects i...

Exhaled nitric oxide (NO) is elevated in asthmatics, and varies with disease severity. We postulated that a respiratory virus infection increases exhaled NO levels in asthma, and examined the relationship between the virus-induced changes in exhaled NO and in airway hyperresponsiveness to histamine. In a parallel study, seven patients underwent experimental rhinovirus 16 (RV16) inoculation at d...

Inhalation of organic dust from swine houses causes an intense inflammatory reaction in the respiratory tract, and increased bronchial responsiveness to methacholine in healthy subjects. The aims of the present study were to investigate whether exhaled nitric oxide (NO) is a marker of the inflammation caused by exposure to organic dust (swine dust), whether there is a relationship between an in...

Machado, Roberto F., James K. Stoller, Daniel Laskowski, Shuo Zheng, Joseph A. Lupica, Raed A. Dweik, and Serpil C. Erzurum. Low levels of nitric oxide and carbon monoxide in 1-antitrypsin deficiency. J Appl Physiol 93: 2038–2043, 2002. First published August 30, 2002; 10.1152/japplphysiol.00659.2002.—Quantitations of exhaled nitric oxide (NO) and carbon monoxide (CO) have been proposed as noni...

BACKGROUND Increased production of nitric oxide (NO) by the lower respiratory tract is viewed as a marker of airway inflammation in asthma and bronchiectasis. NO is a potentially important immune modulator, inhibiting the release of several key pro-inflammatory cytokines. As sarcoidosis is characterised by granulomatous airway inflammation, we hypothesised that exhaled NO levels might be raised...

BACKGROUND Caffeine is known to inhibit phosphodiesterases, to mobilise intracellular calcium, and to act as an antagonist at adenosine receptors, all of which can potentially alter nitric oxide (NO) production. It was therefore hypothesised that caffeine may alter exhaled NO (eNO) levels. METHODS In a randomised, single blind, crossover manner, 12 normal subjects consumed either (1) coffee a...

Exhaled nitric oxide (NO) has been extensively investigated as a noninvasive marker of airway inflammation in asthma. The increased NO expression induced by inflammatory mediators in airways can be monitored easily in exhaled air from asthmatic children. Based on the relationship between the increased NO expression and eosinophilic airway inflammation, fractional exhaled nitric oxide (FeNO) mea...

Much interest is now being focused on measurements of nitric oxide (NO) in exhaled air. In healthy subjects exhaled NO seems to originate mainly in the nasal airways, whereas the contribution from the lower respiratory tract is low. In certain inflammatory airway disorders, the excretion of NO into the airways is altered resulting in changes in the levels of NO in exhaled air. New techniques ha...

We were interested to read the paper by LEHTIMÄKI et al. [1] recently published in the European Respiratory Journal, in which those authors reported that ‘‘high pre-treatment levels of J9aw,NO [bronchial nitric oxide flux] are related to symptom relief and improvement of airway obstruction’’ when inhaled fluticasone is given to patients with chronic obstructive pulmonary disease (COPD). Their d...