Evaluation of PaCO2 trend in COVID-19 patients undergoing helmet CPAP in the emergency department. Emergency Care Journal, [S. l.], v. 19, n. 2, 2023. DOI: 10.4081/ecj.2023.11274. Disponível em: https://www.pagepressjournals.org/ecj/article/view/11274. Acesso em: 2 jun. 2026.