Zhang 2018.

Methods	RCT, parallel‐group design. Single‐centre study
Participants	Total number of participants: 45 Setting: emergency department ("EICU"), China Inclusion criteria: COPD, invasive MV; ready for extubation Exclusion criteria: none in abstract
Interventions	Intervention group (HFNC): n = 21 Control group (NIV): n = 24
Outcomes	All outcomes measured: incidence of aspiration; incidence of pressure ulcers; incidence of delirium; oxygenation; PaCO2; length of ICU stay; 28‐day mortality; reintubation rate Outcomes relevant to this review: oxygenation; PaCO2; length of ICU stay; 28‐day mortality; reintubation rate
Notes	Contact: Zhang Jingchen, Department of Emergency Medicine, The First Affiliated Hospital of Zhejiang University School of Medicine, Zhejiang Provincial Poison Control Center We did not source the full text of this study which was published in Chinese; we have taken the current information from the English abstract. This study requires translation into English in order to be incorporated into the review. We will seek translation when completing the next review update.