Changes in arterial blood gas measurements in response to oxygen
| 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 |