Internal jugular vein (IJV) diameter at various angles of Trendelenburg tilt
| Trendelenburg angle | Mean IJV diameter(mm) | 95% CI | Range |
|---|---|---|---|
| 0 | 13.5 | 12.8 to 14.1 | 9.9–23.5 |
| 10 | 15.5 | 14.9 to 16.1 | 11.2–25.7 |
| 15 | 15.5 | 14.8 to 16.1 | 10.7–26.2 |
| 20 | 16.4 | 15.7 to 17.0 | 10.9–28.2 |
| 25 | 16.7 | 16.1 to 17.4 | 11.7–25.4 |
| 30 | 16.7 | 16.1 to 17.4 | 10.9–26.5 |