Table 1.
Baseline patient characteristics.
| HFNO n = 40 |
FMO n = 40 |
p | |||
|---|---|---|---|---|---|
| Age, years | 36.7 | 9.2 | 36.7 | 9.1 | 0.9806 |
| Sex, male | 20 | 50.0 | 18 | 45.0 | 0.6543 |
| Body mass index, linear, kg·m−2 | 40.3 | 36.6–43.8 (30.9–51.6) |
40.0 | 35.1–47.1 (31.9–59.2) |
0.5572 |
| Body mass index, binary, kg·m−2 | 0.8230 | ||||
| <40 | 19 | 47.5 | 20 | 50.0 | |
| ≥40 | 21 | 52.5 | 20 | 50.0 | |
| Waist circumference, cm | 124.0 | 13.0 | 126.5 | 15.4 | 0.4468 |
| ASA physical status | 0.8230 | ||||
| Class II | 19 | 47.5 | 20 | 50.0 | |
| Class III | 21 | 52.5 | 20 | 50.0 | |
| Modified Mallampati score | 0.4144 | ||||
| Class I | 11 | 27.5 | 7 | 17.5 | |
| Class II | 7 | 17.5 | 13 | 32.5 | |
| Class III | 13 | 32.5 | 11 | 27.5 | |
| Class IV | 9 | 22.5 | 9 | 22.5 | |
| Current cigarette smoking | 20 | 50.0 | 14 | 35.0 | 0.1748 |
| Current alcohol drinking | 7 | 17.5 | 7 | 17.5 | >0.9999 |
| Coexisting disease | |||||
| Hypertension | 14 | 35.0 | 13 | 32.5 | 0.8131 |
| Diabetes mellitus | 8 | 20.0 | 6 | 15.0 | 0.5562 |
| Chronic kidney disease | 2 | 5.0 | 0 | 0 | 0.4937 |
| Fatty liver | 34 | 85.0 | 30 | 75.0 | 0.2636 |
| Obstructive sleep apnea | 13 | 32.5 | 19 | 47.5 | 0.1709 |
| Preoperative blood test | |||||
| Hemoglobin, g·dL−1 | 14.4 | 13.7–15.6 (10.8–17.8) |
14.7 | 13.8–15.4 (8.7–17.4) |
0.9654 |
| Creatinine, mg·dL−1 | 0.74 | 0.61–0.88 (0.40–1.51) |
0.74 | 0.61–0.87 (0.47–1.11) |
0.9424 |
| eGFR, mL·min·1.73 m−2 | 110.7 | 92.6–129.6 (53.9–189.9) |
115.1 | 92.3–125.4 (74.5–166.5) |
0.8211 |
| Sodium, mmol·L−1 | 139 | 137–140 (134–144) |
138 | 137–140 (130–145) |
0.7187 |
| Potassium, mmol·L−1 | 3.9 | 3.8–4.1 (3.3–4.4) |
3.9 | 3.6–4.1 (3.4–4.4) |
0.8130 |
| Alanine aminotransferase, U·L−1 | 30 | 24–54 (15–242) |
32 | 25–41 (12–159) |
0.9501 |
| Aspartate aminotransferase, U·L−1 | 36 | 24–47 (12–91) |
31 | 22–48 (16–305) |
0.5410 |
Values are mean ± standard deviation, counts (percent), or median (interquartile range; minimum and maximum). Abbreviations: ASA, American Society of Anesthesiologists; eGFR, estimated glomerular filtration rate; FMO, facemask oxygenation; HFNO, high-flow nasal oxygenation.