Evaluation of the interrupter technique for measuring change in airway resistance in 5‐year‐old asthmatic children

Phagoo, S B; Wilson, N M; Silverman, M

doi:10.1002/ppul.1950200609

Cited by 60 publications

(82 citation statements)

References 27 publications

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“…With this technique, measurements of the resistance of the respiratory system (Rint) can be carried out quickly, with minimal cooperation of the child. Rint measurements have been shown to be reproducible [1,[4][5][6], sufficiently sensitive to detect (sub)clinical airway obstruction [6,7], and to correlate satisfactorily with measurements of airway resistance [4,8,9]. The technique can not only be used as a tool to screen for airway obstruction, but also to assess the responses to bronchodilating and bronchoconstricting agents [1,3,10].…”

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confidence: 99%

Measurements of interrupter resistance: reference values for children 3–13 yrs of age

Merkus¹,

Arets²,

Joosten³

et al. 2002

Eur Respir J

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The interrupter technique is a convenient and sensitive technique for studying airway function in subjects who cannot actively participate in (forced) ventilatory function tests.Reference values for preschool children exist but are lacking for children w7 yrs. Reference values were obtained for expiratory interrupter resistance (Rint,e) in 208 healthy Dutch Caucasian children 3-13 yrs of age.A curvilinear relationship between Rint,e and height was observed, similar to published airways resistance data measured by plethysmography. No significant differences in cross-sectional trend or level of Rint,e were observed according to sex. It was found that Z-scores could be used to express individual Rint,e values and to describe intra-and interindividual differences based on the reference equation: 10 logRint,e=0.645-0.006686 standing height (cm) kPa?L -1 ?s -1 and residual SD (0.093 kPa?L -1 ?s -1 ).Expiratory interrupter resistance provides a tool for clinical and epidemiological assessment of airway function in a large age range. Eur Respir J 2002; 20: 907-911.

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confidence: 99%

Measurements of interrupter resistance: reference values for children 3–13 yrs of age

Merkus¹,

Arets²,

Joosten³

et al. 2002

Eur Respir J

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“…Muchos estudios publicados se han realizado con muestras pequeñas (< 30 pacientes), 14,20,21 aunque existen algunos trabajos con poblaciones más numerosas. [4][5][6][7] Además, la mayoría de las publicaciones incluyeron a niños menores de 7 años.…”

Section: Discussionunclassified

“…El aparato calcula la Rint durante la espiración según dos métodos de análisis descritos por Phagoo. 20,21 En este estudio se empleó únicamente la extrapolación lineal trasera.…”

Section: Materials Y Métodosunclassified

“…Algunos trabajos sí han evaluado la reproducibilidad a corto plazo y la variabilidad en el tiempo, aunque con muestras pequeñas. 4,5,32 Al igual que otros trabajos previos, 4,6,[17][18][19]21,28 no hay diferencias significativas entre las medidas, lo que indica que la fiabilidad de la técnica es adecuada, similar a la de otras técnicas de medición de resistencias. 26 En un estudio previo 33 se encontraron diferencias pequeñas entre las mediciones con boquilla y mascarilla, por lo que se prefirió el uso de mascarilla.…”

Section: % Fev1unclassified

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Evaluación de la medición de las resistencias pulmonares por técnica de interrupción

Reyna¹

2013

Arch Argent Pediat

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RESUMENIntroducción. Las pruebas de función pulmonar permiten objetivar el grado de obstrucción bronquial en sujetos colaboradores. La medición de las resistencias pulmonares por métodos pasivos es muy útil en sujetos no colaboradores. El objetivo de este estudio fue evaluar la aplicabilidad de la medición de resistencias por interrupción (Rint) en la edad pediátrica, valorando su reproducibilidad, fiabilidad y exactitud en relación con otras técnicas de medición de resistencias. Material y métodos. Estudio transversal en niños de entre 2 y 18 años, sanos y con patología obstructiva. Se midió la Rint con un aparato portátil y se comparó con las resistencias medidas por oscilometría y pletismografía. Se valoró la reproducibilidad de las mediciones y la influencia de diferentes variables (uso de mascarilla o boquilla, sujeción de mejillas o uso de pinza nasal). Resultados. De 460 niños (47,6% menores de 7 años) se obtuvieron medidas válidas en el 82,6%. La reproducibilidad fue muy buena (CCI= 0,9412; p < 0,00001), sin encontrar diferencias entre las medidas obtenidas separadas en el tiempo (0,75 ± 0,3 contra 0,74 ± 0,28; p= 0,435). Ninguno de los factores antes mencionados afectó la reproducibilidad de las medidas. Los valores de resistencia obtenidos por pletismografía y oscilometría fueron superiores a los obtenidos por Rint, con una correlación positiva entre ambos. La correlación con la pletismografía disminuía cuanto mayor era el grado de obstrucción. Conclusiones. La medición de Rint es factible y reproducible, y se correlaciona bien con las resistencias medidas por oscilometría o pletismografía, por lo que sería de utilidad en los pacientes poco colaboradores. En los pacientes obstruidos, podría infraestimar la resistencia, dificultando su uso para el seguimiento de una patología obstructiva moderada-grave o en las pruebas de provocación bronquial. Palabras clave: resistencia de la vía aérea, Rint, función pulmonar, estudio de evaluación, edad pediátrica.http://dx

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“…The device estimates the Rint during exhalation using the two methods of analysis described by Phagoo. 20,21 In this study, the only method used was the linear back-extrapolation. Measurements were performed in the sports center (healthy subjects) and in the pulmonary function laboratory of the Pulmonology Division (subjects with a respiratory disease).…”

Section: Methodsmentioning

confidence: 99%

Assessing the measurement of airway resistance by the interrupter technique

Reyna¹

2013

Arch Argent Pediat

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Introduction. Pulmonary function tests allow an objective assessment of the degree of bronchial obstruction in collaborative subjects. The measurement of airway resistance using passive methods is very helpful in non-collaborative subjects. The objective of this study was to assess the applicability of measuring airway resistance by the interrupter technique (Rint) in pediatric subjects, determining its reproducibility, reliability and accuracy versus other techniques to measure airway resistance. Material and Methods. Cross-sectional study in healthy children and in children with an obstructive airway disease, all aged 2-18 years old. The Rint was measured using a portable device and results were compared to airway resistance measured by oscillometry and plethysmography. The reproducibility of measurements and the influence of the different outcome measures (use of mask or mouthpiece, cheek support, or nose clip) were assessed. Results. Valid measurements were obtained in 82.6% of 460 children (47.6% younger than 7 years old). Reproducibility was very good (ICC= 0.9412; p <0.00001), and no differences were found among the measurements obtained at separate time intervals (0.75 ± 0.3 versus 0.74 ± 0.28; p= 0.435). None of the factors indicated before had an effect on the reproducibility of measurements. Resistance values obtained by plethysmography and oscillometry were higher than those obtained using the Rint, with a positive correlation between them. The higher the degree of airway obstruction, the worse the correlation with plethysmography. Conclusions. The Rint measurement is a plausible and reproducible technique, and has an adequate correlation with the resistance measurements obtained using oscillometry or plethysmography, thus making it useful for noncollaborative patients. In patients with airway obstruction, this technique could underestimate resistance, so it would be a hurdle to use it to follow-up subjects with a moderate to severe obstructive disease or in bronchial challenge tests.

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Evaluation of the interrupter technique for measuring change in airway resistance in 5‐year‐old asthmatic children

Cited by 60 publications

References 27 publications

Measurements of interrupter resistance: reference values for children 3–13 yrs of age

Measurements of interrupter resistance: reference values for children 3–13 yrs of age

Evaluación de la medición de las resistencias pulmonares por técnica de interrupción

Assessing the measurement of airway resistance by the interrupter technique

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