COPD
Long-term oxygen therapy criteria?

a) PaO₂ ≤ 60 mmHg or SaO₂ ≤ 90%
b) PaO₂ ≤ 70 mmHg or SaO₂ ≤ 92%
c) PaO₂ ≤ 80 mmHg or SaO₂ ≤ 94%
d) PaO₂ ≤ 90 mmHg or SaO₂ ≤ 96%