A few weeks ago had a oxygen assessment my level was low so went today for another one. I have been very tachycardia anyway my oxygen level still low so now I am back on oxygen after two years of not having it. 4lt it is it was 2lt last Time and for 16 hours. Now it is for Twenty four hours . My tachycardia has slowed down and the nurse today said maybe after a while of being on it .it may slow down which would mean my hart won't have to work so hard trying to get enough oxygen around . I have walking oxygen so I won't be trapped in the house all told it's not very nice having oxygen again but the upside is it will give my hart a boost thanks for listening or reading!