COPD 患者肺内可有严重的过度充气,用体容积描记法测定重度气道阻塞者的功能残气量,常等于甚至超过肺总量的预计值.肺过度充气可减低气道阻力,从而改善气体分布,增加每分钟通气量,这些表现可能与呼吸肌代偿性变化有关.肺急性过度充气时吸气肌无充分时间发生代偿适应性变化,且过度充气对不同呼吸肌影响也不尽相同.作者观察仰卧位麻醉狗从功能残气位充气到肺总量时膈肌缩短30%以上,而胸骨旁肋间肌仅缩短约 Patients with COPD may experience severe over-inflation in the lungs, and volumetric plethysmography may be used to measure the functional residual capacity of patients with severe airway obstruction, which often equals or exceeds the predicted value of the total lung volume. Overexpression of the lungs can reduce airway resistance and thus improve gas Distribution, increased ventilation per minute, these performance may be compensatory changes in respiratory muscle related to acute over-inflated lung inspiratory muscle does not have time to compensate for compensatory changes, and over-inflated on different respiratory muscles are not the same The authors observed that supine position anesthesia dogs inflated to more than 30% of the total volume of the lungs from functional residual capacity, while the parasternal intercostal muscles shortened only by about 30%