Covid-19: Belfast doctor warns oxygen supplies under 'extreme pressure' By Marie-Louise Connolly & Lesley Anne McKeown BBC News NI media captionOxygen supplies 'under extreme pressure' A respiratory doctor at Belfast's Mater Hospital has warned that hospital oxygen supplies are under "extreme pressure". Dr Nick Magee also said more younger patients were now being treated in hospital than during the first and second waves of the Covid-19 pandemic. He said in the past they did not have to consult other NI hospitals about how much oxygen they had. "That was never a thing in previous January flu problems," he told the BBC.