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People with COPD who need and use continuous oxygen therapy 24 hours a day tend to have a longer lifespan than those who use it only while awake (15 hours per day). In turn, individuals who use oxygen therapy 15 hours per day do better than those who use it only while they are sleeping. Publication Review By: Peter B. Terry, M.D., M.A. Published: 08 Aug 2011
Normal CO= 5 L/m, normal a-v difference is 5 LO2/mL. Thus, normal VO2 is 250 mL O2/minute. Which is to say, for each minute we are sitting still we consume 250 mLs of oxygen. The average day is 24 hours; 1 hour=60 minutes, 60*24= 1440 minutes per day. (1440 minutes/day) * (250 mL O2/minute) = 360,000 mL O2/day, or 360 LO2/day.