Treating acutely ill patients with too much oxygen can be life threatening, Canadian study finds

                    <img src='https://i.cbc.ca/1.4639610.1524869031!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/derek-lam-and-waleed-alhazzani.jpg' alt='Derek Lam and Waleed Alhazzani' width='460' title='Study authors Derek Lam, left, and Waleed Alhazzani say ' height='259' />                Oxygen is given to millions of patients around the world every day, but too much of it can be harmful and life-threatening, according to a new Canadian scientific paper that in one expert's view "is a very significant landmark study."