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目的对不同时相的呼吸阻力及其稳定因素、影响因素进行研究,为该项技术临床应用提供依据。方法用强迫振荡技术(IOS)测定219例6~14岁儿童(男性121例,女性98例)的呼吸总阻抗(Zrs)、不同振荡频率的黏性(R rs)及电抗(X rs)、响应频率(Fres)等参数,并比较不同残气量位、功能残气量位、肺总气量位、功能肺总气量位时各阻力的异同及特征。结果通过残气容量(RV)、功能残气量(FRC)、肺总量(TLC)呼吸阻抗比较显示,气道阻力随身高增长,其功能残气量位小于残气量位,但肺及胸廓呼吸阻力反之。结论残气量位气道阻力的测定可能有助于提高测定气道阻塞敏感性。
OBJECTIVE To study the respiratory resistance, stability factors and influential factors in different phases of exposure to provide the basis for the clinical application of this technique. Methods Respiratory impedance (Zrs), Rrs and reactance (X rs) were measured in 219 children aged 6-14 years (121 males and 98 females) by forced oscillation technique (IOS) Response frequency (Fres) and other parameters, and compare the similarities and differences and characteristics of different respiration, functional residual capacity, total lung capacity, functional total lung capacity. Results Comparisons of respiratory resistance between residual capacity (RV), functional residual capacity (FRC), and total lung volume (TLC) showed that airway resistance increased with height and its functional residual capacity was smaller than that of residual gas, but lung and thoracic respiration resistance on the contrary. Conclusions The determination of airway resistance in residual volume may be helpful to improve the sensitivity of airway obstruction.