Changes in umbilical arterial and venous blood flow velocity waveforms during late decelerations of the fetal heart rate

Dana P. Damron, David G. Chaffin, Caroline F. Anderson, Kathryn L Reed

Research output: Contribution to journalArticle

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Abstract

Objective: To compare umbilical arterial and venous Doppler velocity waveforms during labor in fetuses with normal heart rate tracings and fetuses with late decelerations. Methods: During labor, umbilical arterial and venous Doppler flow velocity waveforms were obtained between and during contractions in 20 fetuses (ten with normal heart rate tracings and ten with late decelerations). The umbilical arterial systolic-diastolic (S/D) velocity ratios were compared, and umbilical venous velocities were examined for the presence or absence of venous pulsations. Results: Fetuses with late decelerations had a significant increase in the umbilical arterial S/D ratio between contractions compared to normal fetuses (2.43 ± 0.74 versus 1.56 ± 0.27, P = .003). There was no significant difference in S/D ratios obtained between contractions compared with those obtained during contractions in either the normal or late deceleration group. Umbilical venous pulsations were significantly more common (90 versus 0%, P < .00001) during contractions in fetuses with late decelerations; umbilical venous pulsations were not seen in these fetuses between contractions and were not present at any time in fetuses with normal heart rate tracings. Conclusions: Increased umbilical arterial velocity ratios and the presence of umbilical venous pulsations during contractions in fetuses with late decelerations suggest that the cardiovascular pathophysiology of late decelerations involves changes in placental resistance as well as cardiac performance. The presence of umbilical venous pulsations during late decelerations is consistent with the hypoxic fetal cardiovascular changes (hypertension and myocardial depression) previously reported from animal studies. (Obstet Gynecol 1994;84:1038-40).

Original languageEnglish (US)
Pages (from-to)1038-1040
Number of pages3
JournalObstetrics and Gynecology
Volume84
Issue number6
StatePublished - 1994

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Umbilicus
Fetal Heart Rate
Deceleration
Blood Flow Velocity
Fetus
Heart Rate
Hypertension

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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Changes in umbilical arterial and venous blood flow velocity waveforms during late decelerations of the fetal heart rate. / Damron, Dana P.; Chaffin, David G.; Anderson, Caroline F.; Reed, Kathryn L.

In: Obstetrics and Gynecology, Vol. 84, No. 6, 1994, p. 1038-1040.

Research output: Contribution to journalArticle

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N2 - Objective: To compare umbilical arterial and venous Doppler velocity waveforms during labor in fetuses with normal heart rate tracings and fetuses with late decelerations. Methods: During labor, umbilical arterial and venous Doppler flow velocity waveforms were obtained between and during contractions in 20 fetuses (ten with normal heart rate tracings and ten with late decelerations). The umbilical arterial systolic-diastolic (S/D) velocity ratios were compared, and umbilical venous velocities were examined for the presence or absence of venous pulsations. Results: Fetuses with late decelerations had a significant increase in the umbilical arterial S/D ratio between contractions compared to normal fetuses (2.43 ± 0.74 versus 1.56 ± 0.27, P = .003). There was no significant difference in S/D ratios obtained between contractions compared with those obtained during contractions in either the normal or late deceleration group. Umbilical venous pulsations were significantly more common (90 versus 0%, P < .00001) during contractions in fetuses with late decelerations; umbilical venous pulsations were not seen in these fetuses between contractions and were not present at any time in fetuses with normal heart rate tracings. Conclusions: Increased umbilical arterial velocity ratios and the presence of umbilical venous pulsations during contractions in fetuses with late decelerations suggest that the cardiovascular pathophysiology of late decelerations involves changes in placental resistance as well as cardiac performance. The presence of umbilical venous pulsations during late decelerations is consistent with the hypoxic fetal cardiovascular changes (hypertension and myocardial depression) previously reported from animal studies. (Obstet Gynecol 1994;84:1038-40).

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