Table 1.
Diameter of inferior vena cava, and diameter and peak velocity and volume flow of right main portal vein and middle hepatic vein during rest and Valsalva maneuver
| Vessel | Parameter | Rest (n=30) | VM (n=30) | P-value |
|---|---|---|---|---|
| IVC | Diameter (cm) | 1.94±0.40 | 0.56±0.66 | <0.001 |
| MHV | Diameter (cm) | 0.60±0.15 | 0.38±0.20 | <0.001 |
| Minimal velocity (cm/sec) | -7.98±5.47 | 25.74±13.13 | <0.001 | |
| Maximal velocity (cm/sec) | 21.34±6.89 | 35.12±19.95 | 0.002 | |
| Volume flow (mL/min) | 106.94±97.65 | 153.90±151.80 | 0.014 | |
| RMPV | Diameter (cm) | 0.78±0.21 | 0.76±0.20 | 0.485 |
| Minimal velocity (cm/sec) | 20.21±8.22 | 18.73±7.43 | 0.351 | |
| Maximal velocity (cm/sec) | 26.79±8.85 | 24.93±9.91 | 0.275 | |
| Volume flow (mL/min) | 391.52±265.63 | 378.43±239.36 | 0.315 |
VM, Valsalva maneuver; IVC, intrahepatic inferior vena cava; MHV, middle hepatic vein; RMPV, right main portal vein.