SPO2 readings lower on BiPAP than nasal cannula - what's wrong?
My father has COPD. He also is fighting pneumonia and has been put on a BiPAP machine after being in the hospital for a week. His SPO2 was hitting 98 on the BiPAP and he was getting much better until he started coughing and couldn't dislodge any phlegm. Ever since then, his readings on the BiPAP are around 89-90 while they are around 95 on nasal cannula. Is the BiPAP pushing some blockage further in? Has anyone experienced this?