Prospective, randomized comparison of two supplemental oxygen methods during gastroscopy with propofol mono-sedation in obese patients

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

Characteristic	WNJT group, n = 49	Nasal cannula group, n = 52	P value
Age (yr)	37.89 ± 13.7	37.5 ± 12.5	0.892
Height (m)	1.7 ± 0.1	1.7 ± 0.1	0.293
Weight (kg)	100.7 ± 17.0	96.4 ± 18.2	0.217
Sex (M/F)	19/30	16/36	0.398
Body mass index (kg/m2)	35.6 ± 4.8	34.7 ± 4.1	0.316
Baseline SpO2 (%)	97.1 ± 1.5	97.1 ± 1.6	0.982
ASA physical status grade (I/II)	22/27	23/29	0.946
Procedure times (min)	4.6 ± 0.9	4.8 ± 0.4	0.065
Total propofol dosages (mg)	229.4 ± 41.7	210.2 ± 45.4	0.030

Data are presented as the mean ± SD or number of patients. ASA: American Society of Anesthesiologists; SpO₂: Pulse oxygen saturation; WNJT: Wei nasal jet tube.

Table 2 The lowest pulse oxygen saturation, interventions related to hypoxemia and adverse events

	WNJT group, n = 49	Nasal cannula group, n = 52	P value
Lowest SpO2 during gastroscopy	95.5 ± 4.3	90.0 ± 7.0	0.000
Airway opening maneuvers	7 (14.3)	36 (69.2)	0.000
Facemask ventilation	0 (0)	4 (7.7)	0.118
Body movement	7 (14.3)	5 (9.6)	0.468
Cough	5 (10.2)	4 (7.7)	0.926
Epistaxis (0/1/2/3)	0/2/1/0 (6.1)	0/0/0/0 (0)	0.111
Sore throat	2 (4.1)	1 (1.9)	0.610

Data are presented as the mean ± SD or the number of patients (percent), as needed. SpO₂: Pulse oxygen saturation; WNJT: Wei nasal jet tube.

Table 3 Satisfaction of physicians, anesthetists and patients

	WNJT group, n = 49			Nasal cannula group, n = 52			P values
	Good	Fair	Poor	Good	Fair	Poor
Physicians	49 (100)	0 (0)	0 (0)	46 (88.5)	5 (9.6)	1 (1.9)	0.015
Anesthetists	46 (93.9)	2 (4.1)	1(2.0)	38 (73.1)	12 (23.1)	2 (3.8)	0.006
Patients	49 (100)	0 (0)	0(0)	52 (100)	0 (0)	0 (0)	1.000

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