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Exhaled and nasal nitric oxide as a marker of pneumonia in ventilated patients

Adrie, C and Monchi, M and Dinh-Xuan, AT and Dall'Ava-Santucci, J and Dhainaut, JF and Pinsky, MR (2001) Exhaled and nasal nitric oxide as a marker of pneumonia in ventilated patients. American Journal of Respiratory and Critical Care Medicine, 163 (5). 1143 - 1149. ISSN 1073-449X

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Because inflammation stimulates the expression of inducible nitric oxide (NO) synthase (iNOS) with an associated increased local NO production, we hypothesized that patients with pneumonia would have increased excretion of NO into their airways. To test this hypothesis, NO was measured in the exhaled air and from the nasal cavities of 49 consecutively intubated and mechanically ventilated patients in our ICU. After excluding NO gas contamination in the inspiratory circuit, nasal NO and end-expiratory and mean exhaled tracheal NO levels and plasma nitrate concentrations were measured using a fast response chemiluminescence analyzer. Twenty-one patients (43%) presented with infectious pneumonia. End-expiratory exhaled NO concentrations were significantly higher in patients with pneumonia as compared with patients without pneumonia (5.9 ± 1 ppb versus 3.2 ± 0.5 ppb, p < 0.01). Similarly, mean nasal NO was higher in patients with pneumonia (1039 ± 138 ppb versus 367 ± 58 ppb, p = 0.003). Plasma nitrate levels did not differ between patient groups. Threshold values of tracheal or nasal NO were defined and subsequently validated in 60 other patients. Positive and negative values of a maximal tracheal level > 5 ppb for pneumonia were 74% and 89%, respectively. Thus tracheal and nasal NO levels may be of help in distinguishing patients with acute pneumonia from other causes. Furthermore, because these differences in airway NO levels were not paralleled in blood nitrite concentrations, we conclude that pneumonia per se is not associated with systemic NO production.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Adrie, C
Monchi, M
Dinh-Xuan, AT
Dall'Ava-Santucci, J
Dhainaut, JF
Pinsky, MRpinsky@pitt.eduPINSKY0000-0001-6166-700X
Date: 1 January 2001
Date Type: Publication
Journal or Publication Title: American Journal of Respiratory and Critical Care Medicine
Volume: 163
Number: 5
Page Range: 1143 - 1149
DOI or Unique Handle: 10.1164/ajrccm.163.5.9906049
Schools and Programs: School of Medicine > Critical Care Medicine
Refereed: Yes
ISSN: 1073-449X
PubMed ID: 11316650
Date Deposited: 22 Mar 2012 20:59
Last Modified: 30 Jan 2020 16:55


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