由于呼吸肌的驱动作用,使胸廓扩张和收缩,从而改变肺容量的大小而产生通气。通气的作用是使新鲜空气进入肺饱,以及排出经过气体交换的肺泡气。正常肺通气功能的维持主要取决于三个因素,即呼吸肌功能,胸廓与肺的舒缩功能,以及呼吸道的通畅程度。呼吸肌衰 Due to the respiratory muscle drive, the expansion and contraction of the thorax, thereby changing the size of the lung capacity and ventilation. The function of ventilation is to bring fresh air into the lungs and to expel the gas exchanging alveolar gas. The maintenance of normal lung ventilation depends mainly on three factors, namely, respiratory muscle function, thoracic and pulmonary systolic and diastolic function, and the degree of airway patency. Respiratory muscle failure