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Vol. 20. Issue 2.
Pages 75-83 (March - April 1984)
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Vol. 20. Issue 2.
Pages 75-83 (March - April 1984)
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Propiedades reologicas del esputo
Rheological properties of sputum.
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12188
L.A. Oteo Ochoa, A. Sueiro Bendito
Servicio de Neumología. C.E. Ramón y Cajal de la S.S
A. Ruiz Mateo*
* Ingeniero de Caminos. Centro de Estudios y Experimentación de Obras Públicas (Madrid)
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Mediante la utilización de un viscosímetro capilar se analizaron reológicamente 44 muestras de esputo original pertenecientes a cuatro tipos de secreción traqueobronquial previamente establecidos. El diagrama resultante para cada uno de los tipos fue expresado en función de las variables shear strees versus viscosidad aparente observando un comportamiento reológico típico de los fluidos no newtonianos. En las curvas representativas, se analizaron tres zonas bien diferenciadas para los esputos mucoso, mucopurulento y mucopurulento hemático, no observándose este comportamiento en el esputo purulento. Se valoraron las posibles causas de esta significativa conducta reológica diferencial. Se define a shear stress saturación como una variable reológica que incorpora un criterio objetivo en la interpretación lógica de los cambios físicos del esputo. Finalmente, se obtuvo la viscosidad aparente de todos los especímenes frescos a (Y = 25s-1) y se analizó estadísticamente en función del tipaje previo. Los resultados reológicos obtenidos se interpretan y correlacionan con los diferentes sistemas fibrilares de la secreción traqueobronquial.

We analyzed rheologically 44 samples of sputum from 4 prevously established types of tracheobronchial secretions by using a capillary viscometer. For each different type, the resulting diagram was expressed as a function of the variables shear stress vs. apparent viscosity and a rheological behaviour typical of non-newtonian fluids was observed. Three well differentiated zones were demonstrated in the representative curves of mucous sputum, mucopurulent sputum and, bloody mucopurulent sputum; this could not be demonstrated with purulent sputum. The possible causes for this significant different rheological behaviours were analyzed. Shear stress saturation is defined as a rheological variable which incorporates an objective criterium for the logical interpretation of physical changes of sputum. Finally, the apparent viscosity at (Y = 25 s-1) of all fresh specimens was obtained and was statistically analyzed according to previous typing. The rheological results were interpreted and correlated with the different fibrilar systems of tracheobronchial secretion.

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Copyright © 1984. Sociedad Española de Neumología y Cirugía Torácica
Archivos de Bronconeumología
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