In 2017, I had surgery and had pulmonary and cardiac complications. I was monitored closely during #2 and #3 surgeries and my oxygen level stayed low. I was released by an oxygen machine.
I have never smoked and have lived in a smoke free home. I have never ever had respiratory problems other than colds and sinus issues.
What causes these complications?? Unknown, but my doctor strongly recommend that I stay home as I am considered high risk due to these complications.
@+1: Glad your friend is improving. Prayers continue. Please update