Introduction Non-invasive ventilation (NIV) delivered by helmet has been used for respiratory support of patients with acute hypoxaemic respiratory failure due to COVID-19 pneumonia. The aim of this study was to compare helmet NIV with usual care versus usual care alone to reduce mortality. Methods and analysis This is a multicentre. pragmatic. https://www.ngetikin.com/limited-buy-LA-Williams-Belial-Dragon-by-LA-Williams-Google-Pixel-2-Skin-p114135-best-save/