NPB840呼吸机吸气压力触发与吸气流量触发比较

Comparison of the Triggers for the Inspiratory Pressure and Inspiratory Flow in NPB840 Ventilator

目的比较NPB840呼吸机在不同PEEP下吸气压力触发与吸气流量触发呼吸机时触发压力、触发流速、触发时间的差异。方法将FLUKE VT-Plus气流分析仪串联在待测呼吸机与主动模拟肺之间,通过主动模拟肺模拟病人的自主呼吸,气流分析仪采集自主呼吸触发呼吸机时的呼吸参数及波形。结果相同呼气末正压(PEEP)下压力触发的触发压力略高于流量触发的触发压力;相同PEEP下流量触发流速要大于压力触发流速。PEEP为0时,压力触发和流量触发时的触发时间差异最大,随着PEEP值的增加,压力触发和流量触发时的触发时间差异逐渐减少,当PEEP为15 cm H2O时,两者的触发时间接近。结论通过对NPB840呼吸机在不同PEEP下吸气压力触发与吸气流量触发呼吸机时触发压力、触发流速、触发时间的测试,证明NPB840呼吸机使用流量触发方式时触发灵敏度较高,是医生在进行呼吸机治疗时灵敏度设定的首选。

Objective To understand the difference between the pressure and the flow velocity as well as the trigger time of the NPB840 ventilator in different modes of positive-end expiratory pressure（PEEP） under the suction pressure and the inspiratory flow. Methods Connect the FLUKE VT-Plus flow analyzer series to the measured ventilator and then to the simulated lungs with the Norway active system. Through the active simulation of lungs and patients＇ spontaneous breathing, the analyzer acquisited parameters and waveform from the ventilator triggered by spontaneous breathing. ResultsUnder the same mode of PEEP, the trigger for the inspiratory pressure is slightly higher than that of the inspiratory flow. The flow rate of the same PEEP is greater than that of the inspiratory pressure. When the PEEP is 0, the trigger time between the pressure and the flow rate is different. The time difference decreased with the increase of PEEP value. When the PEEP is 15 cm H2 O, the trigger time between the inspiratory pressure and the flow rate is similar. Conclusion After testing the difference between the pressure and the flow velocity, as well as the difference of the trigger time between the inspiratory pressure and flow rate in the NPB840 ventilator under different modes of PEEP, it is proved that the sensitivity of NPB840 ventilator under the flow mode is superior to that under the mode of of inspiratory pressure.