Department of Anesthesia and Intensive Care, Military Hospital Val-de-Grace, 74 Boulevard de Port Royal, Paris, France.
Eur J Emerg Med. 2011 Apr;18(2):77-80. doi: 10.1097/MEJ.0b013e32833d6a8a.
Exacerbation of asthma can be seen during air transport. Severe patients, not responding to conventional therapy, require ventilator support. We evaluated the performance of two transport ventilators, built with turbine technology, the T-birdVSO2 and the LTV-1000, for use during aeromedical evacuation of acute severe asthma. We have assessed the ability of both the ventilators to deliver to an acute severe asthma model a tidal volume (Vt) set at different simulated altitudes, by changing the ambient air pressure.
The simulated cabin altitudes were 1500, 2500, and 3000 m (decompression chamber). Vt was set at 700 and 400 ml in an acute severe asthma lung model. Comparisons of the preset with the actual measured values were accomplished using a t-test.
Comparisons between the actual delivered Vt and set Vt showed a significant difference starting at 1500 m for both the ventilators. The T-birdVSO2 showed a decrease in the volume delivered, with a negative variation of more than 10% compared with the Vt set. The LTV-1000 showed mostly an increase in the volume delivered. The delivered Vt remained within 10% of the set Vt.
The accuracy of Vt delivery was superior with the LTV-1000 than with the T-birdVSO2, but the higher delivered Vt of the LTV-1000 are likely to be more harmful than lower delivered Vt of the T-birdVSO2.
在空运过程中可能会出现哮喘加重的情况。对于严重的患者，在常规治疗无效的情况下，需要呼吸机支持。我们评估了两种使用涡轮技术制造的转运呼吸机，即 T-birdVSO2 和 LTV-1000，用于急性严重哮喘的航空医疗后送。我们评估了这两种呼吸机在模拟不同海拔高度时输送潮气量（Vt）的能力，通过改变环境气压来实现。
模拟舱高度分别为 1500、2500 和 3000 米（减压舱）。在急性严重哮喘肺模型中，Vt 设置为 700 和 400ml。使用 t 检验比较预设值与实际测量值。
对于两种呼吸机，从 1500 米开始，实际输送的 Vt 与预设 Vt 之间的比较存在显著差异。T-birdVSO2 显示输送的体积减少，与预设 Vt 的差值超过 10%。LTV-1000 主要显示输送的体积增加。输送的 Vt 仍保持在预设 Vt 的 10%以内。
LTV-1000 输送 Vt 的准确性优于 T-birdVSO2，但 LTV-1000 输送的较高 Vt 可能比 T-birdVSO2 输送的较低 Vt 更有害。
