Inhibitory effects of carbon dioxide insufflation on pneumoperitoneum and bowel distension after percutaneous endoscopic gastrostomy

Table 2 The amount of administered midazolam, duration of percutaneous endoscopic gastrostomy procedure, and arterial blood gas analyses immediately before and after the procedure (mean ± SD)

	Air group	CO2 group	P value
Amount of midazolam (mg)	2.53 ± 1.14	2.53 ± 1.45	0.995
Duration of procedure (s)	835 ± 145	889 ± 128	0.143
Arterial blood gas analysis
PCO2 (mmHg)
Before procedure	38.9 ± 4.9	38.6 ± 4.4	0.837
After procedure	41.6 ± 5.6	41.9 ± 4.8	0.778
Elevation during procedure	2.67 ± 2.82	3.32 ± 3.14	0.408
PO2 (mmHg)
Before procedure	83.0 ± 11.8	84.4 ± 9.3	0.612
After procedure	79.3 ± 10.6	83.1 ± 9.8	0.213
Depression during procedure	3.72 ± 8.95	1.34 ± 7.07	0.302
pH
Before procedure	7.479 ± 0.035	7.471 ± 0.023	0.295
After procedure	7.454 ± 0.031	7.435 ± 0.031	0.018
Depression during procedure	0.025 ± 0.031	0.036 ± 0.027	0.125

PCO₂: Pressure of carbon dioxide; PO₂: Pressure of oxygen; CO₂: Carbon dioxide.