Subjects | Treatment | Changes | Magnitude |
---|---|---|---|
Four patients | 100% O2 for 10 minutes by mask | Four patients—increased Paco2 | Range: 2–14 mm Hg |
Three patients—decreased pH | Largest decrease: 0.09 | ||
Six patients | O2 1–2 l/min for 10 minutes by nasal cannula | Six patients—increased Paco2 | Range: 2–7 mm Hg |
Five patients—decreased pH | Largest decrease: 0.05 | ||
Five patients | O2 1–2 l/min for 150–240 minutes by nasal cannula | Four patients—increased Paco2 | Range at 30 minutes: minus 2–6 mm Hg |
Three patients—decreased pH | Largest decrease at 30 minutes: 0.03 |