Safety and efficacy of carbon dioxide insufflation during gastric endoscopic submucosal dissection

Table 3 Transcutaneous carbon dioxide tension values, transcutaneous oxygen saturation values, and oxygen flow rate

Variable	CO2 group (n = 36)	Air group (n = 51)	P value
Baseline PtcCO2, mmHg	39 (28-52)1	40 (22-51)1	NS
PtcCO2 after ESD, mmHg	50 (41-68)1	50 (40-64)1	NS
Peak PtcCO2, mmHg	52 (43-68)	51 (40-64)	NS
PtcCO2 > 60 mmHg during ESD	3 (8.3)	2 (3.9)	NS
Minimum SpO2, %	98 (90-100)	98 (89-100)	NS
Oxygen flow rate, L/min	2 (1-5)	2 (2-4)	NS

¹The PtcCO₂ increased significantly (P < 0.001) after the procedure. Data are presented as n (%) or median (range). ESD: Endoscopic submucosal dissection; PtcCO₂: Transcutaneous carbon dioxide tension; SpO₂: Transcutaneous oxygen saturation.