正常人平静呼吸时,呼气末肺的容量与呼吸系统的弹性平衡容量(即舒张容量,Vr)相一致的。COPD患者由于气道阻力增加妨碍了肺排空的速率,呼气末肺的容量可大于Vr,可存在有动力肺过度膨胀。最近研究结果表明,大多数COPD患者呼气末肺泡压力是呈正压的。作者最近应用同心针电极证实,在许多稳定期严重的COPD患者平静呼吸时的呼气相,存在着腹横 Normal calm breathing, end-expiratory lung capacity and respiratory elastic balance capacity (ie, diastolic volume, Vr) consistent. COPD patients impede the rate of lung emptying due to increased airway resistance, the capacity of the end-expiratory lung may be greater than Vr, and there may be over-expansion of powered lungs. Recent findings show that most end-expiratory pressure in COPD patients is positive pressure. The recent application of concentric needle electrodes confirms that in many stable COPD patients, the expiratory phase during calm breathing has a ventral transverse