定压通气模式下吸痰负压对机械通气病人肺容量及呼吸力学的影响

Influence of negative pressure of suction under constant pressure ventilation on lung volume and respiratory mechanics in patients with mechanical ventilation

[目的]探讨定压通气模式(PCV)下机械通气病人适宜的吸痰负压。[方法]采用自身前后对照设计,在PCV模式下对33例机械通气病人分别采用80mmHg(1mmHg=0.133kPa)、150mmHg、300mmHg负压行开放式吸痰,比较吸痰前后不同时间病人肺容量及呼吸力学的变化。[结果]PCV模式下,不同吸痰负压及吸痰后不同时间病人的潮气量和分钟通气量不同(P<0.05),且不同负压吸痰后病人的肺动态顺应性不同(P<0.05)。[结论]PCV模式下机械通气病人适宜的吸痰负压为150mmHg。

Objective:To probe into appropriate suction vacuum of patients with mechanical ventilation under constant pressure ventilation(PCV).Methods:The self front and back control design was used,a total of 33 patients with mechanical ventilation received open sputum suction respectively with 80mmHg(1mmHg=0.133kPa),150 mmHg,300mmHg negative pressure under PCV,then to compare the changes of lung volume and respiratory mechanics in patients in different time before and after sputum suction.Result:Under PCV model,the patients tidal volume and minute volume were different under different suction vacuum and different time after sputum suction(P<0.05).Dynamic lung compliance was different in patients with different vacuum suction(P<0.05).Conclusion:Appropriate suction vacuum for patients with mechanical ventilation under PCV was 150 mmHg.