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首页> 外文期刊>Air medical journal >The Hypoxia Alarm of a Multigas Analyzer Is Triggered During Helicopter Takeoffs in Helicopter Emergency Medical Services Operations
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The Hypoxia Alarm of a Multigas Analyzer Is Triggered During Helicopter Takeoffs in Helicopter Emergency Medical Services Operations

机译：在直升机紧急医疗服务运营中的直升机起飞期间触发了Multigas分析仪的缺氧报警

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Objective: Safety in helicopter emergency medical services (HEMS) settings might be enhanced by the routine use of portable multigas analyzers to indicate hypoxic ambient air mixtures and the presence of hazardous gases. Methods: In our HEMS (EC-135, Lifeliner 1, Amsterdam, The Netherlands), we introduced a professional multigas analyzer (Gas Alert Max XT II; Honeywell Analytics, Lincolnshire, IL) to prospectively detect possible hazardous gas mixtures. This analyzer measures ambient oxygen percentage (FO_2, 0%-30%), carbon monoxide (CO, 0-1,000 ppm), hydrogen sulfide (H_2S, 0-200 ppm), and combustibles (lower explosive limit, %). Results: Before 12 HEMS flights, we measured a stable baseline ambient FO_2 of 20.9%. However, in all flights, takeoff to cruising altitude (500-1,000 ft) markedly decreased the measured FO_2 to 19.1% ± 0.1% (mean ± standard deviation; Wilcoxon signed rank test, P = .002) with a minimum of 18.8%. This triggered the optoacoustic hypoxia alarm (preset to 19.5% to comply with international guidelines) in all cases. Maintaining cruise altitude restored measured FO_2 slowly back to 20.9%. In contrast, CO, H_2S, and combustibles remained unchanged during takeoff and flight. Conclusions: The hypoxia alarm of multigas analyzers is reproducibly triggered during helicopter takeoff. This observation may be explained by properties of certain multigas analyzers using a capillary controlled concentration sensor for FO_2 measurement. Flight crews, increasingly equipped with those multigas analyzers, should be aware of this fact.
机译：目的：通过常规使用便携式Multigas分析仪来表明缺氧环境空气混合物和危险气体存在，可能会加强直升机紧急医疗服务（HEMS）设置。方法：在我们的下摆（EC-135，Lifeliner 1，Amsterdam，荷兰），我们推出了专业的Multigas分析仪（Gas Hanger Max XT II;霍尼韦尔分析，林肯郡，IL），以潜在检测可能的危险气体混合物。该分析仪测量环境氧百分比（FO_2，0％-30％），一氧化碳（CO，0-1,000ppm），硫化氢（H_2S，0-200ppm）和可燃物（较低的爆炸极限，％）。结果：在12个下摆航班之前，我们测量了稳定的基线环境FO_2，为20.9％。然而，在所有航班中，巡航高度（500-1,000英尺）的起飞显着降低了测量的FO_2至19.1％±0.1％（平均值±标准偏差; Wilcoxon签名等级测试，P = .002），至少为18.8％。在所有情况下，这引发了光声缺氧报警（预设为19.5％以遵守国际指南）。维持巡航高度恢复测量的FO_2慢慢回到20.9％。相比之下，在起飞和飞行期间，CO，H_2S和可燃物保持不变。结论：在直升机起飞期间，多消毒分析仪的缺氧报警器可重复触发。该观察可以通过使用用于FO_2测量的毛细管控制浓度传感器的某些多百长分析仪的性质来解释。飞行机组人员越来越有配备那些Multigas分析仪，应该了解这一事实。

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