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本文介绍了最大用力吸气流量—容量曲线的测定方法,并对健康成人和COPD患者进行了测定。结果表明,健康组与COPD各组间差异均非常显著(P<0.001)。各疾病组吸气流量的减低和吸气时间的延长均与RV/TLC％密切相关(P<0.01)。说明缓解期哮喘患者,用力吸气时亦有气道阻塞现象,而对于肺气肿,特别是重度肺气肿患者则可能与肺容量的增高,致使吸气肌易于发生疲劳有关。另外,肺顺应性的降低和由于肺容量的增高使吸气肌处于明显不利的收缩初长位置、机械效率明显降低等也是吸气流量减低和吸气时间延长的原因之一。
This article describes the determination of maximum forced inspiratory flow-volume curves and measures healthy adults and COPD patients. The results showed that there was significant difference between healthy group and COPD groups (P <0.001). Reduced inspiratory flow and prolonged inspiratory time in each disease group were closely related to RV / TLC% (P <0.01). Description of remission in asthmatic patients, forced inspiratory airway obstruction, but also for emphysema, especially in patients with severe emphysema may be associated with increased lung capacity, resulting in fatigue-prone inspiratory muscle. In addition, reduced lung compliance and increased lung capacity so that the inspiratory muscle was significantly unfavorable position of the initial length of contraction, the mechanical efficiency was significantly reduced, and so the flow of inspiratory flow and inspiratory time is one of the reasons prolonged.