Table 4. Fetal Heart Rate and Pulsatility Index (PI) for the Maternal Nonplacental and Placental Uterine Arteries, Placental Arcuate Artery, and Fetal Umbilical, Middle Cerebral, and Renal Arteries before Epidural Injection, 5 min after Injection, and When Sensory Analgesia Reached the T6-T4 Level