Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
Military Department, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic.
Sci Rep. 2022 Feb 8;12(1):2070. doi: 10.1038/s41598-022-06015-y.
Outdoor breathing trials with simulated avalanche snow are fundamental for the research of the gas exchange under avalanche snow, which supports the development of the international resuscitation guidelines. However, these studies have to face numerous problems, including unstable weather and variable snow properties. This pilot study examines a mineral material perlite as a potential snow model for studies of ventilation and gas exchange parameters. Thirteen male subjects underwent three breathing phases-into snow, wet perlite and dry perlite. The resulting trends of gas exchange parameters in all tested materials were similar and when there was a significant difference observed, the trends in the parameters for high density snow used in the study lay in between the trends in dry and wet perlite. These findings, together with its stability and accessibility year-round, make perlite a potential avalanche snow model material. Perlite seems suitable especially for simulation and preparation of breathing trials assessing gas exchange under avalanche snow, and potentially for testing of new avalanche safety equipment before their validation in real snow.The study was registered in ClinicalTrials.gov on January 22, 2018; the registration number is NCT03413878.
户外呼吸试验用模拟雪崩雪是研究雪崩雪中气体交换的基础，这支持了国际复苏指南的发展。然而，这些研究必须面对许多问题，包括不稳定的天气和多变的雪的性质。本初步研究探讨了珍珠岩作为一种潜在的通气和气体交换参数研究的雪模型。13 名男性受试者接受了三个呼吸阶段——进入雪、湿珍珠岩和干珍珠岩。所有测试材料的气体交换参数的趋势是相似的，当观察到显著差异时，研究中使用的高密度雪的参数趋势介于干珍珠岩和湿珍珠岩之间。这些发现，加上其稳定性和全年可及性，使珍珠岩成为一种潜在的雪崩雪模型材料。珍珠岩似乎特别适合模拟和准备评估雪崩雪下气体交换的呼吸试验，并有可能在真正的雪上验证新的雪崩安全设备之前对其进行测试。该研究于 2018 年 1 月 22 日在 ClinicalTrials.gov 上注册；注册号为 NCT03413878。
