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446 E. Ferrazzi, S. Rigano<br />

Fig. 30.2. Umbilical venous flow per unit weight (ml/min<br />

kg ±1 ). Growth-restricted fetuses with abnormal umbilical arterial<br />

pulsatility index (triangles). Growth-restricted fetuses<br />

with normal umbilical arterial pulsatility index (circles). The<br />

2nd, 5th, 50th, 95th, and 98th percentiles of normal reference<br />

values<br />

restriction compared with normal fetuses of comparable<br />

gestational age (129.4 Ô 14.8 vs 176.4 Ô 13.3 ml/<br />

min kg ±1 ; p

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