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Comparison of PetCO2 between the two groups
| Time point | CO2 group (mmHg) | Air group (mmHg) | P value |
| Beginning of ESE | 34.01 ± 2.03 | 33.32 ± 2.21 | 0.78 |
| Removal of the tumors | 31.21 ± 2.35 | 30.59 ± 2.73 | 0.73 |
| Wound management | 32.75 ± 2.69 | 32.01 ± 2.22 | 0.92 |
| 10 min after ESE | 33.23 ± 2.56 | 32.61 ± 2.78 | 0.79 |
ESE: Endoscopic submucosal excavation.
