Table 2.
Comparison of peripheral oxygen saturation (SpO2) and oxygen reserve index (ORI) in patients with and without SpO2 < 97% during endotracheal intubation (ETI)
| Total n = 51 | SpO2 ≥ 97% n = 31 | SpO2 < 97% n = 20 | P value | |
|---|---|---|---|---|
| SpO2 at the start of preoxygenation, median [IQR] | 97.00 [95.00–99.00] | 98.00 [95.00–100.00] | 97.00 [95.00–97.00] | 0.0951 |
| SpO2 at the end of preoxygenation, median [IQR] | 100.00 [99.00–100.00] | 100.00 [99.00–100.00] | 100.00 [99.00–100.00] | 0.5931 |
| SpO2 at ETI, median [IQR] | 99.00 [95.00–100.00] | 100.00 [99.00–100.00] | 93.00 [85.50–97.00] | < 0.0001 |
| ORI at the start of preoxygenation, median [IQR] | 0.04 [0.01–0.13] | 0.05 [0.02–0.20] | 0.04 [0.01–0.12] | 0.2891 |
| ORI at the end of preoxygenation, median [IQR] | 0.62 [0.26–0.83] | 0.71 [0.54–0.94] | 0.39 [0.15–0.65] | 0.0082 |
| Change in ORI from start to end of preoxygenation, median [IQR] | 0.46 [0.15–0.64] | 0.52 [0.23–0.82] | 0.17 [0.10–0.50] | 0.0191 |
| Highest ORI during preoxygenation, median [IQR] | 0.67 [0.31–0.94] | 0.77 [0.59–1.00] | 0.49 [0.22–0.77] | 0.0212 |
| Changes in SpO2 from start to end of preoxygenation, median [IQR] | 3.00 [1.00–4.00] | 2.00 [0.00–4.00] | 3.00 [2.00–5.00] | 0.1181 |
SpO2 oxygen saturation by pulse oximeter; IQR interquartile range; ETI endotracheal intubation; ORI oxygen reserve index