常规机械通气技术作为救治呼吸衰竭的主要手段已广泛应用于临床。然而,该技术仍存在一定的局限性并产生一些副反应,如高平台压导致的肺气压伤,小潮气量通气导致的高碳酸血症等。因此,寻找其他有效的呼吸支持技术具有重要意义。死腔内气体置换(gas exchange in dead space)是近1 Conventional mechanical ventilation as a major method of treatment of respiratory failure has been widely used in clinical practice. However, this technique still has some limitations and produces some side effects such as barotrauma caused by high platform pressure and hypercapnia caused by small tidal volume ventilation. Therefore, to find other effective respiratory support technology is of great significance. The dead space gas exchange (gas exchange in dead space) is nearly 1