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What happens in end stage and how long it can go on is as unique as the person who has the disease. It depends on so many things. Some one running on less than 30 or even 20 percent lung function and live a very long time depending on if anything else is wrong with them. Quality of life ***** in end stage but it can go on for a long time.
I know someone with severe COPD. She has been on oxygen for years and is still OK. I have had COPD for about 20 years and am only in stage !!. I guess ithe progression varies enormously with each person.