Single Umbilical Artery - Neonatal Disorders

What is Single Umbilical Artery (SUA)?

The umbilical cord typically contains three vessels: two arteries and one vein. A Single Umbilical Artery (SUA) occurs when one of these arteries is absent. This condition is detected in about 0.5% to 1% of pregnancies and is more common in multiple gestations and certain maternal conditions.

How is SUA Diagnosed?

SUA is often diagnosed during a routine prenatal ultrasound in the second trimester. The absence of one umbilical artery can be visualized, and further Doppler studies may be conducted to confirm the diagnosis. In some cases, SUA is discovered only after birth when the umbilical cord is examined.

What are the Potential Risks and Complications?

SUA can be associated with several fetal anomalies and complications. These may include:
However, it is important to note that many infants with SUA are born healthy without any associated anomalies.

What Follow-Up and Monitoring is Required?

After SUA is diagnosed, closer prenatal monitoring is often recommended. This may include more frequent ultrasounds to monitor fetal growth and assess for any anomalies. In some cases, a detailed fetal echocardiogram may be performed to check for heart defects. Additionally, genetic counseling and possible amniocentesis may be advised to rule out chromosomal abnormalities.

What is the Prognosis for Infants with SUA?

The prognosis for infants with SUA largely depends on whether there are any associated anomalies. If SUA is an isolated finding, the prognosis is generally good, and the infant is likely to be healthy. However, if there are other anomalies or chromosomal abnormalities, the prognosis may vary based on the severity and nature of those conditions.

What Are the Postnatal Considerations?

After birth, infants with SUA should be carefully examined to rule out any associated anomalies. This may involve physical exams and imaging studies such as renal ultrasound to check the kidneys. If any additional anomalies are detected, appropriate specialist referrals and treatments should be initiated.

Conclusion

Single Umbilical Artery is a relatively common finding in prenatal care. While it can be associated with various anomalies and complications, many infants with SUA are born healthy. Close prenatal monitoring and postnatal examinations are crucial to ensure the best outcomes for these infants.



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