The master protocol for this study is registered at https://www.isrctn.com/ISRCTN14639555 Eligible patients will be app clinical trials

Oxygen treatment using high flow nasal oxygen after major abdominal surgery

This study looks at using a special oxygen treatment (HFNO) after big stomach operations. We want to see if it helps patients recover quicker and avoids problems like chest infections. You'd get either regular oxygen or HFNO for four hours after surgery. This is a small first step to see if a larger study is a good idea.