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The proportion of patients with a predetermined rise in PtCO2 from baseline at 60 minutes
| High concentration n (%) | Titrated n (%) | Relative risk (95% CI) | P value | |
|---|---|---|---|---|
| Change in PtCO2 ≥4 mmHg | 36 (50%) | 11 (14.7%) | 3.4 (1.9 to 6.2) | <0.001 |
| Change in PtCO2 ≥4 mmHg and PtCO2 ≥38 mmHg | 19 (26.4%) | 5 (6.7%) | 2.7 (1.2 to 6.0) | 0.01 |
| Change in PtCO2 ≥8 mmHg | 11 (15.3%) | 2 (2.7%) | 5.7 (1.3 to 25.0) | 0.007 |
