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a Chapter 13 Cerebral and Umbilical Doppler in the Prediction of Fetal Outcome 189<br />

Fig. 13.12. Evolution of C/U reduction (in percentage<br />

from 1.1 cut-off value). The HI is represented<br />

as the area between the C/U (%) bold<br />

curve and the 0% horizontal dotted line (corresponding<br />

to C/U=1.1). a IUGR fetus, delivered<br />

at 34 weeks, normal FHR, HI=81% (approx.:<br />

mean C/U decrease of ±5% ´17 days]. b IUGR<br />

fetus, delivered at 34 weeks, abnormal FHR,<br />

HI =183% (approx.: mean C/U decrease of ±<br />

18%´10 days). c Correlation between occurrence<br />

of abnormal FHR vs C/U ratio (C/U abnormal<br />

when >1.1 ? PPV=57%, NPV= 92%). d Correlation<br />

between occurrence of abnormal FHR<br />

vs hypoxic index. The HI is abnormal when<br />

>160% ? PPV= 87%, NPV=88%

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