Table 2.
Quantitative results of the breathing effects on four parameters of CSF at extracranial (C2-C3) and intracranial (aqueduct) planes
| C2-C3 (n = 25) | ||||||
|---|---|---|---|---|---|---|
| Mean value | Δp | Δp% | Φp° | Δp% without Φp° | p value | |
| Qnet (ml/min) | 9.4 ± 5.6 | 20 ± 9.9 | 6.3 ± 3.1 | 33 ± 27 | 5.3 ± 2.8 | ** |
| Amplitude (ml/min) | 338 ± 82 | 22 ± 9 | 6.8 ± 2.8 | -11 ± 75 | 2.2 ± 3.7 | ** |
| SV (mm3) | 608 ± 160 | 85 ± 56 | 14 ± 7.1 | -36 ± 43 | 8.7 ± 6.4 | ** |
| Tc (ms) | 832 ± 164 | 49 ± 28 | 6.0 ± 3.4 | -64 ± 51 | 2.5 ± 3.4 | ** |
| Aqueduct ( n = 20) | ||||||
| Mean value | Δp | Δp% | Φp° | Δp% without Φp° | p value | |
| Qnet (ml/min) | -0.34 ± 0.93 | 2.8 ± 1.7 | 11 ± 6.8 | 58 ± 36 | 6.5 ± 5.7 | ** |
| Amplitude (ml/min) | 26 ± 12 | 2.9 ± 1.8 | 11 ± 4.9 | -80 ± 82 | -1.6 ± 8.8 | 0.36 |
| SV (mm3) | 55 ± 34 | 9.0 ± 7.5 | 15 ± 5 | -42 ± 60 | 1.9 ± 9.4 | 0.43 |
| Tc (ms) | 837 ± 154 | 51 ± 32 | 5.8 ± 3.4 | -40 ± 47 | 3.4 ± 3.2 | ** |
Δp indicates the difference between the inspiratory and expiratory phases of the corresponding parameter-p, Δp% is the percentage expression. Δp% without Φp° indicates the Δp% without taking into account the phase shift (Φp° = 0). The statistical significance (p-value) of Δp% without Φp° compared to zero is tested with t-test (* = p < 0.05; ** = p < 0.01)