A crossover trial investigating the atmospheric content of improvised respirators

Autor:	Jan Schumacher, Clarissa Carvalho, Kariem El-Boghdadly, Suniel Ramessur, Paul Greig
Rok vydání:	2022
Předmět:	business.product_category Coronavirus disease 2019 (COVID-19) business.industry Medicine Medical emergency Respirator Critical Care and Intensive Care Medicine Critical Care Nursing business medicine.disease Brief Communications Personal protective equipment Crossover study
Zdroj:	J Intensive Care Soc King's College London
ISSN:	1751-1437
Popis:	Introduction This study was designed to determine the respiratory safety of improvised respirators based on modified full-face snorkel masks, making comparisons with a purpose-designed mask Methods This is a prospective crossover study conducted on ten recruits. Volunteers wore snorkel masks mated to an anaesthetic heat and moisture exchange filter. The system was worn at rest then during exercise. Gases were sampled from the mask at 5-min intervals. Results The modified snorkel was satisfactory in seven participants. For three carbon dioxide concentrations were >1%. Two participants exposed to excessive CO2 also experienced oxygen concentrations Conclusions Modifying snorkel masks changes the way that gases circulate through the system. These modifications increase the risk of rebreathing in some users, which may yield an unsafe gas mixture. These improvised masks cannot be recommended as a substitute for purpose-designed equipment.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9551a19d82900a116c21e48236e85e0a https://pubmed.ncbi.nlm.nih.gov/35615239 Zobrazit plný text záznamu