Greig Paul R, Bradshaw James, Carvalho Clarissa, Iwaszko Luke, Ramessur Suniel, Schumacher Jan, El-Boghdadly Kariem
Department of Anaesthetics, Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London, UK.
Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, UK.
J Intensive Care Soc. 2022 Aug;23(3):359-361. doi: 10.1177/1751143721991056. Epub 2021 Jan 29.
This study was designed to determine whether improvised respirators based on modified full-face snorkel masks are able to pass a standard qualitative fit test.
This is a prospective crossover study conducted in 16 staff. Fit-tests were conducted on masks mated to (1) an anaesthetic breathing circuit heat and moisture exchange filter and (2) a CE-marked P3 grade filter. P3 filters were mounted using both epoxy-coated and uncoated adaptors.
None of the tests using anaesthetic filters passed. Only one overall pass was observed using the P3-rated filter mated to the snorkel mask.
These data suggest that improvised PPE designs cannot provide reliable protection against aerosols. Failures are likely due to poor fit, but the suitability of 3D printed materials is also uncertain as fused-filament manufacturing yields parts that are not reliably gas-tight. Improvised PPE cannot be recommended as a substitute for purpose designed systems.
本研究旨在确定基于改良全脸呼吸管面罩的简易呼吸器是否能够通过标准定性适合性测试。
这是一项针对16名工作人员开展的前瞻性交叉研究。对与以下两种情况匹配的面罩进行适合性测试：（1）麻醉呼吸回路的热湿交换过滤器；（2）带有CE标志的P3级过滤器。P3过滤器使用环氧涂层和未涂层的适配器进行安装。
使用麻醉过滤器的测试均未通过。仅观察到与呼吸管面罩匹配的P3级过滤器有一次整体通过。
这些数据表明，简易个人防护装备设计无法提供可靠的气溶胶防护。失败可能是由于贴合性差，但3D打印材料的适用性也不确定，因为熔丝制造生产的部件气密性不可靠。不建议将简易个人防护装备作为专门设计系统的替代品。
