How does the child single umbilical artery meet?

summary

In general, there are two umbilical arteries and one umbilical vein in the umbilical cord blood vessels of the fetus. If the fetus has only one umbilical artery and one umbilical vein, it is called the single umbilical artery. This phenomenon is very low in human beings. It is generally believed that the single umbilical artery itself is one of the markers of fetal abnormal development. However, if there is only one marker of the single umbilical artery, the fetus has no abnormal development, Chromosome is not abnormal, it can only suggest that the probability of fetal abnormalities is about 10 times higher than that of normal fetus. We must do a good job in fetal teratogenesis examination before 28 weeks of pregnancy. So what about the single umbilical artery? I hope this problem can help some people.

How does the child single umbilical artery meet?

First, the absence of an umbilical artery (single umbilical artery) is relatively common in B-ultrasound examination. Some fetuses may be accompanied by chromosomal abnormalities, among which trisomy 13 and trisomy 18 are most frequently involved, while trisomy 21 and sex chromosomal abnormalities rarely occur. Single umbilical artery with chromosomal abnormalities (aneuploid fetuses) can be found by ultrasound, The single umbilical artery should be regarded as high-risk pregnancy for close obstetric evaluation and follow-up observation, because these fetuses are at increased risk of congenital heart disease, premature birth, low weight, hypoxia and kidney disease.

Second, the single umbilical artery interferes with the blood supply during embryonic development, which can cause abnormal development of fetal cardiovascular system, central nervous system, gastrointestinal tract, skeletal system, urogenital system and fetal limbs. The normal umbilical cord contains two arteries and one vein. The color Doppler shows that the color blood signals of one red, two blue or two red and one basket are arranged in a twist, The color Doppler blood flow of single umbilical artery shows a red and a blue convolution accompanied by distribution, so it is easy to see the single umbilical artery when doctors do B-ultrasound examination.

Third: if B-ultrasound finds out the fetal single umbilical artery, we need to do fetal echocardiography at 24-28 weeks of gestation, do secondary system B-ultrasound screening at 20-23 weeks of gestation and 28-32 weeks of gestation, do amniocentesis to check the fetal chromosome 24 weeks ago, and there is no problem. The baby is also well developed, so we should follow up and pay attention to fetal movement. At the same time, we should dynamically monitor the fetal growth and development, Amniotic fluid is normal, the problem is not big, please rest assured.

matters needing attention

Single umbilical artery is a kind of physiological abnormality of umbilical cord, which has no direct relationship with oxygen supply, natural delivery or caesarean section, but the tolerance pressure and blood circulation of single umbilical artery in uterus will be affected to a certain extent, and the probability of fetal hypoxia is relatively large. Therefore, Baoma of single umbilical artery should pay more attention to fetal movement, and caesarean section is relatively safe.