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Rosa also suggests placing one hand on your chest and one on your belly when breathing - the chest hand should be still while the belly hand moves out like you are blowing up a balloon.

Dr Hutchinson continued: "Helium is lighter than air and chemically inert so it can be combined with oxygen to produce a mixture that can aid breathing. This mixture is called heliox and is used to ...

Pope Francis suffers two new breathing attacks as pneumonia worsens, requiring bronchoscopies and continued use of an oxygen mask.