The effect of varying inhaled oxygen concentrations of high-flow nasal cannula oxygen therapy during gastroscopy with propofol sedation in elderly patients: a randomized controlled study

Table 3 Respiratory-related adverse events and intervention

	Group C n = 123	Group H100 n = 123	Group H50 n = 123	P value
Hypoxia	37(30.1)	15(12.2)^*	18(14.6)^*	0.001
SpO₂ < 90%	27(22.7)	7(5.7)^*	9(7.3)^*	P < 0.001
Severe hypoxia	9(7.3)	3(2.4)^*	2(1.6)^*	0.041
Prolonged hypoxia	10(8.1)	2(1.6)	2(1.6)	0.009
Median 1 min after induction of anesthesia SpO₂	99(98, 100)	100(99, 100)	100(99, 100)	0.063
Jaw lift	36(29.3)	12(9.8)^*	11(8.9)^*	P < 0.001
Mask ventilation	15(12.2)	0(0)^*	0(0)^*	P < 0.001
Mechanical ventilation for endotracheal intubation	0(0)	0(0)	0(0)	1.000

Values were presented as a number of patients, number (%), or median (Q1, Q3). ^*Hypoxia、^*SpO₂<90%, ^*Severe hypoxia, ^*Jaw lift, and ^*Mask ventilation were significantly lower in groups H100 and H50, compared to group C

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