Randomized controlled study of the safety and efficacy of nitrous oxide-sedated endoscopic ultrasound-guided fine needle aspiration for digestive tract diseases

Table 1 Electrocardiogram changes in patients during examination

Group	Heart rate		Oxygen saturation			Significant change in electrocardiogram
	> 120 bpm	< 50 bpm	Oxygen desaturation	Hypoxia	Severe hypoxia
Experimental	0	0	1	1	0	0
Control	2	0	1	2	0	0
P value	> 0.05	> 0.05	> 0.05	> 0.05	> 0.05	> 0.05

Table 2 Results of questionnaire

Group	Evaluation by physicians			Patient discomfort			Patient tolerance
	Steady	Ordinary	Not steady	Mild	Moderate	Severe	Good	Medium	Poor
Experimental	17	3	1	18	2	1	18	3	0
Control	11	2	8	6	3	12	9	5	7
P value	< 0.05		< 0.05	< 0.05		< 0.05	< 0.05		< 0.05

Table 3 Patient and physician visual analog scale scores for examination process

Group	Patient satisfaction score	Physician satisfaction score	Willing to receive same examination again n (%)
Experimental	87	91	18 (85.7)
Control	72	70	9 (45)
P value	< 0.05	< 0.05	< 0.05