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Vol. 45. Issue 3.
Pages 143-147 (March 2009)
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Vol. 45. Issue 3.
Pages 143-147 (March 2009)
Techniques and procedures
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Determining the Alveolar Component of Nitric Oxide in Exhaled Air: Procedures and Reference Values for Healthy Persons
Determinación de la concentración de óxido nítrico alveolar en aire espirado: procedimiento y valores de referencia en personas sanas
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Ana María Fortuna
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afortuna@santpau.cat

Corresponding author.
, Marco Balleza, Núria Calaf, Mercedes González, Teresa Feixas, Pere Casan
Unidad de Función Pulmonar, Departamento de Neumología, Hospital de la Santa Creu i Sant Pau, Facultad de Medicina, Universidad Autónoma de Barcelona, Barcelona, Spain
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Abstract

Nitric oxide (NO) production has been described using a 2-compartment model for the synthesis and movement of NO in both the alveoli and the airways. The alveolar concentration of NO (CaNO), an indirect marker of the inflammatory state of the distal portions of the lung, can be deduced through exhalation at multiple flow rates. Our objective was to determine reference values for CaNO. The fraction of exhaled NO (FeNO) was measured in 33 healthy individuals at a rate of 50 mL/s; the subjects then exhaled at 10, 30, 100, and 200mL/s to calculate CaNO. A chemiluminescence analyzer (NIOX Aerocrine) was used to perform the measurements. The mean (SD) FeNO was 15 (6) ppb. The mean CaNO was 3.04 (1.30) ppb. These values of CaNO measured in healthy individuals will allow us to analyze alveolar inflammatory behavior in respiratory and systemic processes.

Keywords:
Fraction of exhaled nitric oxide
Alveolar concentration of nitric oxide
Two-compartment model
Multiple flow rates exhalation
Resumen

La producción de óxido nítrico (NO) se describe mediante un modelo bicompartimental que relaciona la producción y la movilidad de NO desde los alvéolos hacia las vías aéreas. La espiración a múltiples flujos permite deducir la concentración alveolar de NO (CaNO), marcador indirecto del estado inflamatorio de las zonas distales del pulmón. El objetivo fue determinar los valores de referencia de CaNO. En 33 individuos sanos se determinaron la concentración espirada de NO (FeNO) a 50ml/s y la CaNO a 10, 30, 100 y 200ml/s mediante un sensor de quimioluminiscencia (NIOX Aerocrine). El valor medio (± desviación estándar) de FeNO fue de 15±6ppb y de CaNO fue de 3,04±1,30ppb. Los valores de CaNO obtenidos en individuos sanos permitirán analizar el comportamiento inflamatorio alveolar en procesos respiratorios y sistémicos.

Palabras clave:
Óxido nítrico en aire espirado
Concentración alveolar de óxido nítrico
Modelo bicompartimental
Espiración a múltiples flujos
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