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BMJ 2009; 339 doi: (Published 22 July 2009) Cite this as: BMJ 2009;339:b2919
  1. Ali Ali, specialist registrar in geriatrics,
  2. Keith Wiener, consultant biochemist,
  3. Venkat Sridharan, consultant physician
  1. 1Royal Oldham Hospital, Rochdale Road, Oldham OL1 2JH
  1. ali-ali{at}

    A 62 year old woman with multiple sclerosis presented with a blue discolouration of her skin, thought to represent cyanosis. Blood carbon dioxide …

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