Table 2.
Patient characteristics of participants in studies included in the meta-analysis
| Study, group, %* | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kim [22] | Teng [26] | Mazzeffi [27] | Lin [21] | Nay [28] | Riccio [23] | Thiruvenkatarajan [24] | ||||||||
| Characteristic | HFNC n = 36 |
SNC n = 36 |
HFNC n = 50 |
SNC n = 51 |
HFNC n = 132 |
SNC n = 130 |
HFNC n = 994 |
SNC n = 1000 |
HFNC n = 191 |
SNC n = 188 |
HFNC n = 28 |
SNC n = 31 |
HFNC n = 65 |
SNC n = 66 |
| Age, mean yr | 65.3 | 67.3 | 46.7 | 51.6 | 62 | 62 | 48 | 47 | 64$ | 64$ | 54 | 59 | 69.1 | 65.5 |
| Male sex | 61.1 | 69.4 | 38 | 43.1 | 87 | 71 | 41.5 | 41 | 57 | 51 | 14 | 13 | 43.1 | 40.9 |
| Operation | ||||||||||||||
| ERCP | 100 | 100 | 23.5 | 20.8 | 100 | 100 | ||||||||
| EGD | 100 | 100 | 76.5 | 79.2 | ||||||||||
| gastroscopy | 100 | 100 | 18.3 | 20.2 | ||||||||||
| colonoscopy | 52.4 | 48.9 | 100 | 100 | ||||||||||
| combined# | 29.3 | 30.9 | ||||||||||||
| BMI, mean | 23.1 | 22.1 | 22.5 | 23.4 | 28.3 | 28.2 | 22.8 | 23 | 27$ | 26.6$ | 48 | 49 | 30 | 28.2 |
| ASA grade | ||||||||||||||
| 1 and 2 | 52.8 | 58.3 | 100 | 100 | 100 | 100 | 72.3 | 72.4 | 11 | 13 | 20 | 17.7 | ||
| 3 and above | 47.2 | 41.7 | 0 | 0 | 0 | 0 | 27.7 | 27.6 | 89 | 87 | 80 | 83.3 | ||
| Hypoxemia | 0 | 19.4 | 2 | 21.6 | 21.2 | 33.1 | 0 | 8.4 | 9.4 | 33.5 | 39.3 | 45.2 | 7.7 | 9.1 |
| Need for airway intervention | 0 | 30.6 | 2 | 17.6 | 0.8 | 31.9 | 19.9 | 58.5 | 53.6 | 51.6 | 23.1 | 28.8 | ||
ERCP endoscopic retrograde cholangiopancreatography, EGD esophagogastroduodenoscopy, BMI body mass index, ASA American Society of Anesthesiologists, HFNC High-flow nasal cannula oxygen, SNC standard nasal cannula
*Unless otherwise indicated; #gastroscopy and colonoscopy; $median value