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  • Title: Umbilical blood flow velocity waveforms in different maternal positions and with epidural analgesia.
    Author: Marx GF, Patel S, Berman JA, Farmakides G, Schulman H.
    Journal: Obstet Gynecol; 1986 Jul; 68(1):61-4. PubMed ID: 3523331.
    Abstract:
    Umbilical blood flow velocity waves were measured in the fetuses of healthy parturients in early active labor to assess the influence of different maternal positions (N = 16) and of epidural analgesia (N = 16). The ratio of systolic peak to diastolic trough (S/D) of the umbilical blood flow velocity wave is reflective of vascular resistance distal to the point of measurement on the fetal side of the placenta. Umbilical blood flow velocity wave S/D ratios were significantly higher in the supine than in either lateral position indicating that umbilical artery vascular resistance is increased when the mother lies supine. After epidural blockade, the S/D ratios were unchanged in three and lowered to varying degrees in 13 parturients indicating that this method of pain relief beneficially affects umbilical artery vascular resistance.
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