Comparison of middle cerebral artery (MCA) Doppler velocity variables between babies with low and normal superior vena cava (SVC) flow
| Normal SVC flow (n=390) | Low SVC flow (n=99) | p Value* | |
|---|---|---|---|
| Data are medians and range. | |||
| *Mann-Whitney U test. | |||
| MCA diameter (mm) | 1.5 (0.7–2.3) | 1.3 (0.8–1.8) | <0.0001 |
| MCA mean velocity (m/s) | 0.16 (0.0–0.68) | 0.11 (0.03–0.31) | <0.0001 |
| MCA velocity time integral (m) | 0.064 (0.011–0.22) | 0.046 (0.012–0.127) | <0.0001 |
| MCA pulsatility index | 1.47 (0.24–15.93) | 1.52 (0.08–4.28) | 0.106 |
| Mean blood pressure (mm Hg) | 35 (21–54) | 31.5 (15–47) | <0.0001 |
| SVC flow (ml/kg/min) | 70 (41–159) | 30 (7.4–40) | <0.0001 |