Changes in uterine artery Doppler flow velocity waveforms during the third stage of labor

R. Maymon, A. Herman, R. Halperin, I. Bukovsky, Z. Weinraub, S. Ariely

Research output: Contribution to journalArticlepeer-review

Abstract

Transabdominal Doppler velocity waveform measurements of the uterine arteries during the third stage of labor were performed upon 25 patients with uncomplicated vaginal deliveries and 5 with prolonged third stage in order to further assess third-stage mechanisms. Based on Doppler flow measurements, three phases of the third stage of labor were observed: (1) a latent phase with a systolic/diastolic ratio (S/D) and a pulsatility index (PI) of 2.14 ± 0.49 and 0.89 ± 0.17, respectively; (2) a contraction and detachment phase with an S/D and PI of 2.53 ± 0.53 and 1.28 ± 0.37, respectively, and (3) an expulsion phase with an S/D and PI of 2.20 ± 0.34 and 0.91 ± 0.20, respectively (p < 0.05). During the third stage of labor, it was shown that uterine contractions squeezed the uterine vessels as they traversed the myometrium, leading to an increase in the extrinsic resistance, which was reflected by high resistance flow. Following placental separation and changes in the placental-site wall, there was slight uterine relaxation resulting in decreased uterine vessel resistance. This observation encourages the authors to continue investigating the contribution of ultrasound and Doppler flow for studies of the postpartum period.

Original languageEnglish
Pages (from-to)24-27
Number of pages4
JournalGynecologic and Obstetric Investigation
Volume40
Issue number1
DOIs
StatePublished - 1995
Externally publishedYes

Keywords

  • Doppler flow
  • Placental separation
  • Third stage of labor
  • Uterine artery

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