Comparison of two supplemental oxygen methods during gastroscopy with propofol mono-sedation in patients with a normal body mass index

Table 1 Baseline characteristics of patients, procedure time and total propofol dosage

	WNJT group (n = 144)	Nasal cannula group (n = 144)	P value
Age (yr)	53 (40, 60)	55 (41, 60)	0.537
Gender (M/F)	43/101	46/98	0.702
Body mass index (kg/m2)	23 (21,24)	22 (21,24)	0.086
ASA physical classification (1/2)	(32/112)	(41/103)	0.223
Baseline SpO2 (%)	98 (97, 99)	98 (97, 98)	0.061
Procedure times (min)	5.0 (4.4, 5.2)	4.8 (4.5, 5.0)	0.002
Total propofol dosages (mg)	160 (140, 188)	140 (120, 160)	0.000

Data are presented as median (interquartile range) or number of patients. SpO₂: Pulse oxygen saturation; ASA: American Society of Anesthesiologists; WNJT: Wei nasal jet tube.

Table 2 Hypoxemia and lowest pulse oxygen saturation during the gastroscopy, and interventions related to hypoxemia and adverse events

	WNJT group (n = 144)	Nasal cannula group (n = 144)	P value
Total occurrence of hypoxemia	3 (2.1)	21 (14.6)	0.000
Hypoxemia	2 (1.4)	19 (13.2)	0.000
Severe hypoxemia	1 (0.7)	2 (1.4)	1.000
Lowest SpO2	98 (97, 99)	96 (93, 98)	0.000
Airway opening maneuvers	4 (2.8)	36 (25)	0.000
Facemask ventilation	0 (0)	4 (2.8)	0.131
Body movement	8 (5.6)	9 (6.3)	0.803
Cough	10 (6.9)	11 (7.6)	0.821
Epistaxis (0/1/2/3)	0/7/0/0 (4.9)	0 (0)	0.022
Sore throat	2 (1.4)	3 (2.1)	1.000

Data are presented as median (interquartile range) or number of patients (percent). SpO₂: Pulse oxygen saturation; WNJT: Wei nasal jet tube.

Table 3 Satisfactions of physicians, anesthetists and patients

	WNJT group (n = 144)			Nasal cannula group (n = 144)			P value
	Good	Fair	Poor	Good	Fair	Poor
Physicians	143 (99.3)	1 (0.7)	0	139 (96.5)	4 (2.8)	1 (0.7)	0.214
Anesthetists	140 (97.2)	4 (2.8)	0	134 (93.1)	8 (5.6)	2 (1.4)	0.196
Patients	142 (98.6)	2 (1.4)	0	144 (100)	0	0	0.498

Data are presented as number of patients (percent). WNJT: Wei nasal jet tube.