Article Figures & Data
Figures
- Fig 1.
The pulse wave analysis shows how signal in internal jugular vein is more modulated in supine position (A) than in standing position (B). In each frame, both the internal jugular vein (1) and the external carotid artery (2) are shown.
- Fig 2.
Blood flow in internal jugular vein analyzed by use of QDP technology (1); reference image shows internal jugular vein and common carotid artery (2). Internal jugular vein is analyzed both in supine position (A) and in standing position (B).
Tables
- Table 1:
Velocity and flow analysis in internal jugular vein and vertebral vein in supine and standing positions
Velocity, cm/sa Flow, mL/mina Supine Position Standing Position Supine Position Standing Position IJV right 20.58 ± 12.6 27.33 ± 21.24 357.03 ± 230.6 108.5 ± 117.0 IJV left 12.71 ± 9.23 29.32 ± 20.35 309.06 ± 233.31 126.97 ± 135.25 Total 16.65 ± 11.63 28.33 ± 20.61 666.10 ± 270.45b 235.49 ± 202.35b VV right 9.60 ± 7.00 19.76 ± 12.34 41.25 ± 150.03 21.81 ± 24.02 VV left 7.45 ± 5.64 20.17 ± 16.61 32.45 ± 136.65 20.94 ± 26.45 Total 9.60 ± 7.01 19.64 ± 12.86 73.70 ± 197.31 42.75 ± 38.13 IJV + VV total 12.58 ± 10.19 24.14 ± 17.60 739.80 ± 326.32b 278.24 ± 207.94b - Table 2:
Differences of area between internal jugular vein and vertebral vein in supine and standing positions
Area, cm2a Supine Position Standing Position IJV right 0.42 ± 0.40 0.07 ± 0.06 IJV left 0.41 ± 0.25 0.07 ± 0.06 Total 0.83 ± 0.56 0.14 ± 0.09 VV right 0.02 ± 0.01 0.02 ± 0.01 VV left 0.06 ± 0.25 0.02 ± 0.01 Total 0.08 ± 0.25 0.03 ± 0.02 IJV + VV total 0.91 ± 0.61 0.17 ± 0.09 ↵a Mean ± SD.
Ratio >2 Right Smaller IJV supine 9/25 (36%) 6/9 (67%) VV supine 15/25 (60%) 5/15 (34%)
