From: 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
Group C
(n = 123)
Group H100
Group H50
P value
Duration, min
9 (8, 11)
9 (8, 10)
0.177
Dose of propofol, mg
139.6 ± 22.3
143.2 ± 22.1
142.7 ± 18.5
0.068
Wake-up time, min
3 (3, 4)
3 (2, 4)
4 (3, 4)
0.056