Table 1.
Region of interest | F | PN | PD | F vs PN | F vs PD | PN vs PD | |
---|---|---|---|---|---|---|---|
Average flow rate (ml/s) | ICA | 7.52 ± 1.75 | 6.06 ± 1.61 | 4.73 ± 1.25 | < 0.001 | < 0.001 | < 0.001 |
IJV | − 7.31 ± 2.29 | − 5.74 ± 2.45 | − 4.52 ± 2 | < 0.001 | < 0.001 | < 0.001 | |
CSF | 0 ± 0.11 | 0.02 ± 0.12 | 0.04 ± 0.11 | 0 | 0 | 0 | |
Absolute CSF | 1.09 ± 0.29 | 1.12 ± 0.35 | 1.11 ± 0.39 | 1 | 1 | 1 | |
Cross-sectional area (mm2) | ICA | 33.23 ± 7.52 | 33.27 ± 6.15 | 30.75 ± 5.16 | 1 | 0.209 | 0.038 |
IJV | 38.21 ± 26.45 | 37.73 ± 27.67 | 36.01 ± 24.12 | 1 | 0.985 | 1 | |
CSF | 178.9 ± 53.45 | 186.31 ± 48.98 | 182.82 ± 54.34 | 0.974 | 1 | 1 | |
Systolic peak (caudal peak for the CSF) | ICA | 10.29 ± 2.44 | 8.64 ± 2.50 | 6.73 ± 2.00 | < 0.001 | < 0.001 | < 0.001 |
IJV | − 9.08 ± 3.14 | − 7.10 ± 3.41 | − 5.44 ± 2.65 | < 0.001 | < 0.001 | < 0.001 | |
CSF | − 1.81 ± 0.60 | − 1.83 ± 0.60 | 1.54 ± 0.57 | 1 | 0.016 | 0.002 | |
Diastolic peak (cranial peak for the CSF) | ICA | 5.11 ± 1.34 | 3.83 ± 1.19 | 2.79 ± 0.99 | < 0.001 | < 0.001 | 0.001 |
IJV | − 5.90 ± 2.05 | − 4.73 ± 1.76 | − 3.91 ± 1.72 | < 0.001 | < 0.001 | 0.006 | |
CSF | 1.44 ± 0.53 | 1.54 ± 0.53 | 1.49 ± 0.59 | 0.360 | 1 | 1 |
Mean values ± standard deviation are reported. The free (F), paced normal (PN), paced and deep (PD) respirations paired comparisons are all significant with p < 0.05