Table 3.
Preoperative hemodynamic and hydrodynamic parameters in syrinx and non-syrinx patients. CC: cardiac cycle, SVaqu: stroke volume of CSF in Sylvius aqueduct, SVforamen: stroke volume of CSF at the foramen magnum level, SVtonsils: stroke volume of tonsils, SVcerv: stroke volume of CSF at cervical level, SVvasc: stroke volume of arteriovenous system, AMPvenous: amplitude of venous flow curve, correction factor: factor of correction for venous flow curve—when it is close to 1, venous drainage is mainly due to the jugular veins, whereas, when it is >1, an accessory pathway is involved, SVsyrinx: stroke volume into the syringomyelia.
| Syringomyelia | No Syringomyelia | p | |
|---|---|---|---|
| SVaqu (μL/CC) | 24 ± 17 | 43 ± 25 | 0.13 |
| SVforamen (μL/CC) | 429 ± 317 | 176 ± 122 | 0.11 |
| SVtonsils (μL/CC) | 313 ± 197 | 332 ± 112 | 0.85 |
| SVcerv (μL/CC) | 458 ± 378 | 391 ± 155 | 0.62 |
| SVvasc (μL/CC) | 1649 ± 492 | 1689 ± 369 | 0.84 |
| AMPvenous (mm3/s) | 5201 ± 2391 | 6080 ± 2661 | 0.44 |
| Correction factor | 1.49 ± 0.4 | 1.19 ± 0.1 | 0.05 |