辅助给氧能减轻COPD 患者静息时的呼吸困难。作者假设此乃由于①动脉氧合作用的改善;②通气减少;③气流对鼻腔受体的刺激作用所致。本实验选择8例中至严重程度的COPD 患者,有静息时呼吸困难,PaO_2多低于90mmHg。FEV_1/FVC 多低于50%。在鼻腔利多卡因麻醉前后通过鼻套管给不同流 Assisted oxygen can reduce breathing difficulties at rest in COPD patients. The authors hypothesized that this was due to ① improved arterial oxygenation; ② decreased ventilation; and ③ airflow induced by nasal receptors. In this study, 8 patients with moderate to severe COPD were selected, who had dyspnea at rest, and more than 90 mmHg of PaO_2. FEV_1 / FVC less than 50%. Nasal lidocaine anesthesia before and after the nasal cannula to different flow