The difference between U-shaped and W-shaped nuchal cords.

Written by Du Rui Xia

Obstetrics

Updated on December 11, 2024

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During pregnancy, through ultrasound examination, if echoes of the umbilical cord are found around the fetus’s neck in U-shaped or W-shaped patterns, this indicates the presence of nuchal cord. The difference between U-shape and W-shape primarily lies in the number of wraps around the neck. A U-shaped notch indicates the umbilical cord is wrapped around the neck once; a W-shape indicates it is wrapped twice. When nuchal cord is present, there is no need to be overly anxious; regular prenatal check-ups can be conducted at the hospital to monitor the development of the nuchal cord and the safety of the fetus inside the uterus.

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Written by Zhang Lu

Obstetrics

58sec

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What should I do if the fetal umbilical cord is wrapped around the neck once?

During the prenatal ultrasound, it is sometimes discovered that the umbilical cord is wrapped around the fetus's neck, which concerns many pregnant women who fear it may cause fetal hypoxia in utero or affect natural childbirth. However, this concern is not accurate. Currently, in clinical practice, an umbilical cord around the neck is considered a normal physiological phenomenon. Around 30%-40% of fetuses may have the umbilical cord wrapped around their neck. It is acceptable for the umbilical cord to be wrapped around the neck once or twice, as this neither impacts the fetus's oxygen levels nor affects the mode of childbirth; natural birth can still be considered. Therefore, when the umbilical cord is wrapped around the neck once, no intervention is required. Follow the normal prenatal check-up routine and pay attention to fetal movements in daily life. As long as the fetal movements are normal, it indicates that the fetal condition in the uterus is good.

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Written by Zhang Yin Xing

Obstetrics

1min

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What should I do if the umbilical cord is wrapped around the neck once?

Umbilical cord wrapping around the neck once is a very common phenomenon, occurring in 20% of fetuses. When the umbilical cord wraps around the neck once, if the umbilical blood flow and fetal movements are normal, it indicates that the cord wrapping does not affect the fetus and will not have a direct impact on the fetus's intrauterine growth and development. However, during childbirth, attention must be paid to the possibility that the umbilical cord wrapping may cause difficulties in the descent of the presenting part of the fetus, leading to abnormal umbilical blood flow. If difficulties in the descent of the presenting part and changes in the fetal heart rate occur during delivery, the possibility of umbilical cord wrapping should be considered. If necessary, a cesarean section should be performed to terminate the pregnancy. There are no medications or other treatments that can alleviate umbilical cord wrapping; instead, enhanced prenatal monitoring is sufficient.

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Written by Du Rui Xia

Obstetrics

30sec

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Why doesn't the ultrasound show the umbilical cord around the neck?

Generally, in cases where there is umbilical cord entanglement around the neck, it can be detected through an ultrasound examination. However, if the ultrasound does not show the umbilical cord wrapped around the neck, it is possible that the cord moved back around as the fetus moved during pregnancy. It might also be that the cord is not fully wrapped around the fetus's neck, but rather draped over the shoulder or neck. This situation could also relate to the fetal position, making it undetectable.

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Written by Du Rui Xia

Obstetrics

39sec

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Can nuchal cord be corrected by lying prone?

Nuchal cord refers to a condition during pregnancy where the umbilical cord wraps around the fetus's neck or abdomen due to the baby's continuous movements and changes in position. Lying prone cannot correct a nuchal cord because the fetus can move freely within the womb. In some cases, the baby may even resolve the issue through its movements, so there is no need for excessive worry. It is only necessary to visit the hospital regularly for prenatal check-ups, follow the doctor's advice, and monitor the fetal heart rate. Generally, this does not cause any adverse effects.

home-news-image

Written by Du Rui Xia

Obstetrics

47sec

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The difference between U-shaped and W-shaped nuchal cords.

During pregnancy, through ultrasound examination, if echoes of the umbilical cord are found around the fetus’s neck in U-shaped or W-shaped patterns, this indicates the presence of nuchal cord. The difference between U-shape and W-shape primarily lies in the number of wraps around the neck. A U-shaped notch indicates the umbilical cord is wrapped around the neck once; a W-shape indicates it is wrapped twice. When nuchal cord is present, there is no need to be overly anxious; regular prenatal check-ups can be conducted at the hospital to monitor the development of the nuchal cord and the safety of the fetus inside the uterus.