Department of Surgery, University of Cincinnati Medical Center, Cincinnati, OH, USA.
Respir Care. 2011 Nov;56(11):1791-8. doi: 10.4187/respcare.01176. Epub 2011 May 20.
Portable ventilators continue to decrease in size while increasing in performance. We bench-tested the triggering, battery duration, and tidal volume (V(T)) of 7 portable ventilators: LTV 1000, LTV 1200, Puritan Bennett 540, Trilogy, Vela, iVent 101, and HT50.
We tested triggering with a modified dual-chamber test lung to simulate spontaneous breathing with weak, normal, and strong inspiratory effort. We measured battery duration by fully charging the battery and operating the ventilator with a V(T) of 500 mL, a respiratory rate of 20 breaths/min, and PEEP of 5 cm H(2)O until breath-delivery ceased. We tested V(T) accuracy with pediatric ventilation scenarios (V(T) 50 mL or 100 mL, respiratory rate 50 breaths/min, inspiratory time 0.3 s, and PEEP 5 cm H(2)O) and an adult ventilation scenario (V(T) 400 mL, respiratory rate 30 breaths/min, inspiratory time 0.5 s, and PEEP 5 cm H(2)O). We measured and analyzed airway pressure, volume, and flow signals.
At the adult settings the measured V(T) range was 362-426 mL. On the pediatric settings the measured V(T) range was 51-182 mL at the set V(T) of 50 mL, and 90-141 mL at the set V(T) of 100 mL. The V(T) delivered by the Vela at both the 50 mL and 100 mL, and by the HT50 at 100 mL, did not meet the American Society for Testing and Materials standard for V(T) accuracy. Triggering response and battery duration ranged widely among the tested ventilators.
There was wide variability in battery duration and triggering sensitivity. Five of the ventilators performed adequately in V(T) delivery across several settings. The combination of high respiratory rate and low V(T) presented problems for 2 of the ventilators.
便携式呼吸机的体积不断减小，性能却不断提高。我们对 7 种便携式呼吸机（LTV 1000、LTV 1200、Puritan Bennett 540、Trilogy、Vela、iVent 101 和 HT50）的触发、电池续航时间和潮气量（V(T)）进行了台架测试。
我们使用改良的双腔测试肺模拟自主呼吸，使用弱、正常和强吸气努力来测试触发。我们通过完全充电电池并以 500mL 的 V(T)、20 次/分钟的呼吸频率和 5cmH(2)O 的 PEEP 运行呼吸机来测量电池续航时间，直到呼吸机停止送气。我们使用小儿通气场景（V(T)50mL 或 100mL、呼吸频率 50 次/分钟、吸气时间 0.3s 和 PEEP 5cmH(2)O）和成人通气场景（V(T)400mL、呼吸频率 30 次/分钟、吸气时间 0.5s 和 PEEP 5cmH(2)O）测试 V(T)准确性。我们测量和分析气道压力、体积和流量信号。
在成人设置下，测量的 V(T)范围为 362-426mL。在小儿设置下，V(T)设置为 50mL 时，测量的 V(T)范围为 51-182mL，V(T)设置为 100mL 时，测量的 V(T)范围为 90-141mL。Vela 在 50mL 和 100mL 以及 HT50 在 100mL 时的 V(T)输送均不符合美国测试材料协会的 V(T)准确性标准。触发响应和电池续航时间在测试的呼吸机之间差异很大。
电池续航时间和触发灵敏度差异很大。在几个设置中，有 5 种呼吸机在 V(T)输送方面表现良好。对于其中 2 种呼吸机，高呼吸频率和低 V(T)的组合存在问题。
