Why mask and not cannula? I have been told to use my mask as much as possible and only use cannula for ambulatory. This can be a nuisance when I have visitors in order to have a conversation so I use my cannula then is that o k ? I can't understand the carbon monoxide readings although it is staying at a reasonable reading while using 4 litre oygen for 15 hrs a day which I have only had to use since January after having a chest infection. I have Asthma and I P F
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