Two thumbs up? trial tests which hand grip keeps patients oxygenated during anesthesia

This trial compares two ways of holding a face mask to deliver oxygen to adults under general anesthesia before inserting a breathing tube. One technique uses the thumbs to press down on the mask while the fingers lift the jaw; the other uses the thumb and index finger in a C-shape to press and the remaining fingers to lift. Researchers want to see which method provides more effective ventilation, measured by exhaled air volume, carbon dioxide levels, and oxygen saturation.