High-flow nasal cannula oxygen therapy during anesthesia recovery for older orthopedic surgery patients: A prospective randomized controlled trial

Table 2 Comparison between the conventional mask group and the high-flow nasal cannula oxygen group before the intervention

	Conventional mask group (n = 30)	HFNCO group (n = 30)	P value
Before anesthesia
HR	75.9 ± 11.4	74.7 ± 9.6	0.652
MAP	118.8 (109.0, 128.3)	119.8 (105.0, 126.6)	0.6521
SpO2	98.0 (97.0, 100.0)	99.0 (97.0, 100.0)	0.3211
pH	7.42 (7.40, 7.43)	7.42 (7.41, 7.44)	0.2611
paCO2	37.7 (75.4, 39.7)	38.9 (36.5, 40.6)	0.3291
paO2	78.9 (70.5, 85.3)	76.8 (70.0, 84.0)	0.9531
Glucose	5.5 (5.3, 6.6)	5.6 (5.3, 6.3)	0.9471
Lactic acid	1.3 (1.0, 1.8)	1.3 (1.1, 1.5)	0.6891
Extubation
HR	78.6 ± 11.8	73.9 ± 11.3	0.122
MAP	107.8 (102.3, 126.0)	110.5 (96.8, 117.5)	0.6631
SpO2	100.0 (99.0, 100.0)	100.0 (100.0, 100.0)	0.0401
pH	7.33 (7.30, 7.35)	7.33 (7.30, 7.37)	0.3671
paCO2	48.1 (43.6, 54.1)	48.0 (43.6, 54.7)	0.9761
paO2	75.1 (64.0, 86.3)	74.0 (67.2, 89.7)	0.7511
Glucose	6.2 (5.7, 7.5)	6.6 (5.4, 7.5)	0.9001
Lactic acid	1.8 (1.5, 2.2)	1.7 (1.3, 2.5)	0.9411

¹Mann-Whitney U test.

Data are presented as mean ± SD and median (interquartile spacing). HFNCO: High-flow nasal cannula oxygen; HR: Heart rate; MAP: Mean arterial pressure; paCO₂: Arterial partial pressure of carbon dioxide; paO₂: Arterial partial pressure of oxygen; SpO₂: Saturation of peripheral oxygen.