I'm really worried about someone who's been dealing with COVID since mid-April and was admitted to the hospital because their oxygen levels were low. They spent about 25 days on HFNC support, and now they're stable but still need 2 liters of oxygen. My main concern is about the post-COVID complications, especially the fibrosis they're experiencing. Given that they're also an asthmatic patient, I'm really anxious because whenever the oxygen support is removed, their saturation level drops significantly to around 60 to 70. What could be causing this, and is there something more we should be doing to help with their recovery or improve their oxygen levels?