Yes, I had one in the hospital and told to bring home. I think I used it once since every time they checked my oxygen levels at home by nurse or PT it was 98 or 99 % so I figured I was fine and I did some deep breathing on my own without the silly thing. I do a inhale for 5, hold for 5, exhale for 5 and then hold again and start again. I have done these for years for relaxation, when I cannot sleep and other times.
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Its been as you say an exercise in patience. But I take solace in the fact that slowly but surely, our muscles WILL get stronger and we will be able to do what we need to do, on whatever terrain it may be. Happy healing and