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目的：探讨气道阻塞对用力肺活量的影响。方法：对２６７例肺量计测定结果进行回顾性研究。其中，正常１５４例，气道阻塞１１３例；平均年龄５８．４±１８．１岁。结果：与ＦＥＶ１％＞８０％组相比，ＦＥＶ１％＜８０％者年龄较大，ＶＣ、％ＶＣ、ＦＶＣ、ＦＥＶ１、％ＦＶＣ及ＦＥＶ１％明显降低。在ＦＥＶ１％＞８０％的１５４例中，％ＦＶＣ与ＦＥＶ１％呈负相关（ｒ＝－０．３１１，Ｐ＜０．００１）；而在ＦＥＶ１％＜８０％的１１３例中，％ＦＶＣ与ＦＥＶ１％呈正相关（ｒ＝０．３４２，Ｐ＜０．００１），回归方程为％ＦＶＣ＝２０．８＋０．７８×ＦＥＶ１％。气道阻塞对ＦＶＣ产生明显的影响，即当ＦＥＶ１％＜８０％时，ＦＥＶ１％愈低，％ＦＶＣ下降愈明显。结论：回归方程能够了解气道阻塞对ＦＶＣ的影响程度。
Objective: To investigate the effect of airway obstruction on forced vital capacity. Methods: The results of 267 spirometry were retrospectively studied. Among them, 154 were normal and 113 were airway obstruction. The mean age was 58.4 ± 18.1 years. Results: Compared with FEV1%> 80% group, FEV1% <80% were significantly lower in age, VC,% VC, FVC, FEV1,% FVC and FEV1%. In 154 cases with FEV1%> 80%,% FVC was negatively correlated with FEV1% (r = -0.311, P <0.001), while in 113 cases with FEV1% <80%,% FVC was positively correlated with FEV1 % (R = 0.342, P <0.001). The regression equation was% FVC = 20.8 + 0.78 × FEV1%. Airway obstruction has a significant impact on FVC, that when FEV1% <80%, FEV1% lower,% FVC more obvious decline. Conclusion: The regression equation can understand the extent of airway obstruction on FVC.