Do fetal heart rate deceleration patterns during labor differ between various umbilical cord abnormalities?

Area of Science:

• Obstetrics and Gynecology
• Fetal Monitoring
• Perinatal Medicine

Background:

• Umbilical cord abnormalities are associated with adverse perinatal outcomes.
• Intrapartum fetal heart rate (FHR) patterns are crucial indicators of fetal well-being.
• Understanding the relationship between specific cord abnormalities and FHR patterns can improve intrapartum surveillance.

Purpose of the Study:

• To investigate the association between various umbilical cord abnormalities and intrapartum fetal heart rate (FHR) patterns.
• To identify specific FHR deceleration patterns linked to conditions like nuchal cord, velamentous cord insertion, marginal cord insertion, and hyper-coiled cord.

Main Methods:

• Retrospective analysis of vertex singleton deliveries with and without specific cord abnormalities (nuchal cord, velamentous, marginal, hyper-coiled).
• Evaluation of intrapartum FHR patterns, focusing on variable, early, late, and prolonged decelerations.
• Assessment of deceleration frequencies per uterine contraction during the late first and entire second stages of labor.

Main Results:

• In the first stage of labor, significantly higher frequencies of variable decelerations were observed in cases with velamentous insertion (34.5+/-23.8%) and hyper-coiled cords (27.3+/-25.5%) compared to controls (11.7+/-17.3%).
• No significant differences in deceleration frequencies were found among the various cord abnormality groups during the second stage of labor.

Conclusions:

• Prenatal diagnosis of velamentous cord insertion or hyper-coiled cord warrants intrapartum fetal heart rate tracing.
• FHR monitoring in the first stage of labor may be particularly beneficial for identifying fetal distress in these specific cord abnormality cases.