ABSTRACT
IntroductionNoninvasive ventilation delivered by helmet is has been used for respiratory support of patients with acute hypoxemic respiratory failure due to COVID-19 pneumonia. The aim of this study is to compare helmet noninvasive ventilation with usual care versus usual care alone to reduce the mortality. Methods and analysisThis is a multicenter, pragmatic, parallel, randomized controlled trial that compares helmet noninvasive ventilation with usual care to usual care alone in 1:1 ratio. A total of 320 patients will be enrolled in this study. The primary outcome is 28-day all-cause mortality. The primary outcome will be compared between the two study groups in the intention-to-treat and per-protocol cohorts. An interim analysis will be conducted for both safety and effectiveness. Ethics and disseminationApprovals are obtained from the Institutional Review Boards (IRBs) of each participating institution. Our findings will be published in peer-review journals and presented at relevant conferences and meetings. Trial registration numberNCT04477668 registered on July 20, 2020 Article SummaryO_ST_ABSStrengths and limitations of this studyC_ST_ABSO_LIThis trial compares helmet NIV to usual care for respiratory support of patients with acute hypoxemic respiratory failure due to COVID-19 pneumonia. C_LIO_LIThe trial is a multi-center, pragmatic, parallel randomized controlled trial. C_LIO_LIThe main limitation is the unblinded design due to the nature of the intervention. C_LI