Guoqiang 2018.

Methods	RCT, parallel‐group design
Participants	Total number of randomized participants: 36 Inclusion criteria: AECOPD; hypercapnia; ready for extubation Exclusion criteria: none reported
Interventions	Intervention group (HFNC): n = 19 Control group (NIV): n = 17
Outcomes	All outcomes reported: rate of treatment failure; reintubation rate; vital signs; ABG; comfort score; bronchoscopy for secretion management within 48 hours Outcomes relevant to this review: treatment failure; reintubation rate; vital signs; ABG; comfort score
Notes	Contact: Jing Guoqiang, Binzhou Medical University, Binzhou, China Currently published only as an abstract. We are awaiting publication of the full report in order to assess eligibility, collect sufficient study characteristics, and include data in the review.