Representative segments of fetal heart rate (BPM, beats per minute) and electrocorticogram (ECOG).

<p>Umbilical cord occlusion (UCO) induced changes are shown in 15 minutes segments of FHR, ECOG amplitude (µV) and 95% spectral edge frequency (SEF, Hz). Baseline and the 1^st hour of recovery are shown for comparison. Note an early emergence of the time correlated changes in FHR decelerations and increases in ECOG SEF with modest fetal acidemia (pH = 7.26). The arrows indicate fetal blood sampling and the corresponding pH values at these time points.