Rech Viviane Viegas, Vidal Paula Cristina Vasconcellos, Melo Júnior Hilário Teixeira de, Stein Renato Tetelbom, Pitrez Paulo Márcio Condessa, Jones Marcus Herbert
Universidade Luterana do Brasil, Canoas, RS, Brasil.
J Bras Pneumol. 2008 Oct;34(10):796-803. doi: 10.1590/s1806-37132008001000007.
The interrupter technique is used for determining interrupter resistance (Rint) during quiet breathing. This noninvasive method requires minimal cooperation and can therefore be useful in evaluating airway obstruction in uncooperative children. To date, no reference values have been determined for Rint in a Brazilian population. The objective of this study was to define a prediction equation for airway resistance using the interrupter technique for healthy children aged 3-13 years.
This was a prospective, cross-sectional study involving preschool and school children in Porto Alegre, Brazil, in whom Rint was measured during peak expiratory flow.
One-hundred and ninety-three children were evaluated. Univariate analysis using linear regression showed that height, weight and age correlated significantly and independently with Rint. Multiple regression with height, weight, age and gender as variables resulted in a model in which only height and weight were significant, independent predictors of Rint. Collinearity was identified among height, weight and age.
Reference values and an equation for calculating Rint in healthy children were obtained and are adjusted for height.
阻断法用于在安静呼吸时测定阻断阻力（Rint）。这种非侵入性方法所需的配合极少，因此在评估不合作儿童的气道阻塞情况时可能有用。迄今为止，尚未确定巴西人群中Rint的参考值。本研究的目的是为3至13岁健康儿童使用阻断法确定气道阻力的预测方程。
这是一项前瞻性横断面研究，涉及巴西阿雷格里港的学龄前和学龄儿童，在呼气峰值流量时测量其Rint。
对193名儿童进行了评估。使用线性回归的单变量分析表明，身高、体重和年龄与Rint显著且独立相关。以身高、体重、年龄和性别为变量的多元回归得出一个模型，其中只有身高和体重是Rint的显著独立预测因子。在身高、体重和年龄之间发现了共线性。
获得了健康儿童Rint的参考值和计算方程，并根据身高进行了调整。
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