Table 4.
Hemodynamic and hydrodynamic parameters evolution before and after surgery. 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 (it is analyzed by a semi-automatic segmentation of the tonsils according to the same method as the CSF, this allows a quantification of the pulsatility of the tonsils during a cardiac cycle), SVcerv: stroke volume of CSF at cervical level, SVvasc: stroke volume of arteriovenous system, AMPvenous: amplitude of venous flow curve, correction factor: when >1, it shows that the jugular veins require an accessory venous pathway to drain all cerebral blood flow, SVsyrinx: stroke volume into the syringomyelia. Significant results are shown in bold.
| Preoperative | Postoperative | p | |
|---|---|---|---|
| SVaqu (μL/CC) | 39 ± 33 | 30 ± 26 | 0.36 |
| SVforamen (μL/CC) | 201 ± 124 | 363 ± 231 | 0.02 |
| SVtonsils (μL/CC) | 323 ± 175 | 194 ± 130 | 0.008 |
| SVcerv (μL/CC) | 434 ± 309 | 398 ± 241 | 0.73 |
| SVvasc (μL/CC) | 1661 ± 433 | 1490 ± 532 | 0.10 |
| AMPvenous (mm3/s) | 5578 ± 2469 | 4576 ± 2084 | 0.008 |
| Correction factor | 1.38 ± 0.3 | 1.20 ± 0.3 | 0.04 |
| SVsyrinx (μL/CC) | 118 ± 86 | 26 ± 28 | 0.03 |