negative pressure ventilation(NPV)的用法和样例：
例句
- However, during positive pressure ventilation and balanced anaesthesia, there was no evidence of different effects caused by the two anaesthetics.
然而，处于正压通气及平衡麻醉时，这两种麻醉药效果没有差异。 - Effect on noninvasive positive pressure ventilation for patients with chronic obstructive pulmonary disease after upper abdominal and thoracic surgery.
慢性阻塞性肺病患者无创正压通气术前适应性训练效果观察。
