The absolute difference between venous pressure measurements under general anesthesia and when awake by location
| Location* | No of patients | Increased by 10+ mm Hg N (%) | Increased by 6–9 mm Hg N (%) | Minimal change (−5 to +5) N (%) | Decreased by 6–9 mm Hg N (%) | Decreased by 10+ mm Hg N (%) |
|---|---|---|---|---|---|---|
| Superior sagittal sinus | 23 | 6 (26) | 4 (17) | 7 (30) | 2 (9) | 4 (17) |
| Torcula | 20 | 2 (10) | 4 (20) | 9 (45) | 2 (10) | 3 (15) |
| Transverse sinus | 28 | 4 (14) | 6 (21) | 13 (46) | 2 (7) | 3 (11) |
| Sigmoid sinus | 26 | 5 (19) | 8 (31) | 13 (50) | 0 | 0 |
| Jugular vein | 4 | 0 | 2 (50) | 2 (50) | 0 | 0 |
| Gradient | 30 | 3 (10) | 4 (13) | 11 (37) | 6 (20) | 6 (20) |
*Transverse-sigmoid sinus junction data (n=2) not shown.