模拟肺研究容量控制通气辅用自动变流的意义

目的观察容量控制通气辅用自动变流前后输送潮气量、气道峰压、平均压的变化.方法采用自身配对设计,比较模拟肺在不同顺应性、阻力设定下,采用不同吸气流速容量控制通气,辅用自动变流前后输送潮气量、气道峰压、平均压的变化.结果不同流速、阻力、顺应性设定下,辅用自动变流后输送潮气量不变(P均＞0.05),而气道峰压、气道平均压下降(P均＜0.05).结论在需要保证输送潮气量,又尽可能控制气道峰压、气道平均压时,容量控制通气辅用自动变流是一种较好的方法.

The Significance of Volume-controlled Ventilation Assisted with Autoflow on Model Lung

Objective To demonstrate the changes of delivery tidal volume, peak inspiratory pressure and mean airway pressure before and after volume-controlled ventilation assisted with autoflow. Methods A self-paired design was adopted. Using different velocities of inspiratory flow, the changes of delivery tidal volume, peak inspiratory pressure and mean airway pressure before and after assisted with autoflow were compared under different pre-set compliance and resistance on model lung. Results Under different pre-set flow velocities, resistance and compliance, no significant change of delivery tidal volume before and after assisted with flow was found (P>0.05). However, peak inspiratory pressure and mean airway pressure decreased significantly (P<0.05). Conclusions Volume-controlled ventilation assisted with autoflow may be helpful among the patients whose peak inspiratory pressure and mean airway pressure should be kept in a lower level, while delivery tidal volume should be assured.