As the severity of the obstruction to expiratory flow increases, patients become increasingly dyspneic.
随着呼气性阻塞越来越严重，病人的呼吸困难也逐渐加重。
After 6 months, we observe the patients' condition of lung ventilation, dyspneic respiration and disease resistance.
疗程均为6个月，观察患者肺通气、呼吸困难、抗病能力的改善状况。
After 6 months, we observe the patients' condition of lung ventilation, dyspneic respiration and disease resistance.
疗程均为6个月，观察患者肺通气、呼吸困难、抗病能力的改善状况。
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