Effects of maternal prone position on the umbilical arterial flow

Acta Obstet Gynecol Scand. 1998 Nov;77(10):967-9.


Objective: The objective of our study was to clarify the effect of the maternal prone position on the feto-placental flow. In this position, the uterine compression of the large maternal vessels was expected to be completely eliminated.

Methods: Twenty-three normal pregnant women were cross-sectionally examined in the supine, the left lateral, the right lateral and the prone position. The systolic/diastolic ratios for the umbilical artery were calculated for each position.

Results: The umbilical arterial systolic/diastolic ratio in the prone position significantly decreased compared with that in the supine position. The left and right lateral position showed no significant change in the systolic/diastolic ratio.

Conclusion: The maternal prone position can provide complete relief of uterine compression of the large maternal vessels.

MeSH terms

  • Cross-Sectional Studies
  • Diastole
  • Female
  • Humans
  • Pregnancy
  • Prone Position*
  • Regional Blood Flow
  • Systole
  • Umbilical Arteries / physiology*