PMC2778572_01
Fetal heart rate
tracings during labor the latent phase of labor showing reassuring fetal heart
rate patterns in both twins.
OGI2009-498530.001.jpg
PMC2778572_01_OGI2009-498530.001.jpg
fig1
At this time, the base lines of twins A and B were 150 and 150 bpm, respectively, as shown in Figure 1.
Fetal heart rate
tracings during the active phase of labor showing the increased baseline of
heart rate with variable decelerations in twin A.
OGI2009-498530.002.jpg
PMC2778572_01_OGI2009-498530.002.jpg
fig2
When the cervix was dilated 8 cm, the membranes of twin A were ruptured.  Within 10-20 minutes, the fetal heart rate of twin A was increased to 170-180 bpm with repeated variable decelerations as shown in Figure 2.
PMC2778572_02