Table 2.
CSF hydrodynamic properties measured in supine and upright
| Measurements | Group Average | %Change from Upright | Paired t-test (p-value) | |
|---|---|---|---|---|
| Upright | Supine | |||
| CSF Stroke volume (cm3/cycle) | 0.33 ± 0.13 | 0.52 ± 0.19 | 57.6 | 6.73E−06 |
| Total systolic CSF volume displaced (cm3/cycle) | 0.38 ± 0.13 | 0.56 ± 0.21 | 47.4 | 6.26E−06 |
| Total diastolic CSF volume displaced (cm3/cycle) | − 0.35 ± 0.12 | − 0.57 ± 0.19 | 62.9 | 2.46E−06 |
| Peak systolic CSF flow (cm3/s) | 2.79 ± 0.73 | 2.98 ± 0.91 | 6.8 | 0.10 |
| Peak diastolic CSF flow (cm3/s) | − 0.98 ± 0.25 | − 1.71 ± 0.48 | 74.5 | 1.70E−08 |
| Peak systolic CSF velocity (cm/s) | 1.06 ± 0.32 | 1.16 ± 0.35 | 9.4 | 0.16 |
| Peak diastolic CSF velocity (cm/s) | − 0.37 ± 0.13 | − 0.68 ± 0.24 | 83.8 | 1.06E−07 |
| Area of CSF space (cm2) | 2.71 ± 0.58 | 2.64 ± 0.68 | − 2.6 | 0.48 |
Percentage change was calculated as follows: ((supine-upright)/upright)*100