i've had one pregnant lady who had a 2 vessel cord and iugr. she was on the antepartum side, though, so i dont know about how it affected her baby after birth. (i never found out)
here is something copied and pasted from emedicine website
single umbilical artery occurs in fewer than 1% of cords in singletons and 5% of cords in at least one twin. incidence can be underestimated with gross examination of the cord, especially if the portion close to the placenta is examined, because the arteries often fuse close to the placenta.
single umbilical arteries are found twice as often in white women than in african american and japanese women. diabetes increases the risk significantly. two-vessel cords are found more frequently in fetuses aborted spontaneously. the male-to-female ratio is 0.85:1.
single umbilical artery is believed to be caused by atrophy of a previously normal artery, presence of the original artery of the body stalk, or agenesis of one of the umbilical arteries.
the vessels in the cord are clearly identifiable with ultrasound. the vein usually is larger than the arteries. the presence of only 2 vessels on an ultrasound cross section is highly suggestive of a single umbilical artery.
of infants with a single umbilical artery, 20-50% have associated fetal anomalies, including cleft lip, cardiovascular abnormalities (especially ventricular septal defects and conotruncal defects), ventral wall defects, central nervous system defects, esophageal atresia, spina bifida, diaphragmatic hernia, cystic hygroma, hydronephrosis, dysplastic kidneys, polydactyly, syndactyly, and marginal and velamentous insertion of the cord.
with single umbilical arteries, a 20% perinatal mortality rate exists. two thirds of deaths occur before birth. of the one third of neonates who die postnatally, most have associated congenital abnormalities. many of those without overt abnormalities are premature or have intrauterine growth retardation.
prenatal diagnosis of a single umbilical artery should prompt examination for other anomalies. echocardiograms may be considered because heart defects are common. thirty percent have congenital anomalies, which may include trisomy 13, trisomy 18, and triploidy; trisomy 21 is uncommon. because associated anomalies can occur in any organ system, conduct a detailed anatomy survey whenever a 2-vessel cord is discovered. if anomalies are found, consider fetal karyotyping. because growth is retarded in 30% of affected fetuses, consider a third trimester ultrasound for fetal growth. twenty percent are delivered prematurely. the perinatal mortality rate is approximately 20%. use neonatal ultrasound liberally to examine for anomalies.
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[color=#333399]single umbilical artery
[color=#333399]velamentous insertion and vasa previa
[color=#333399]cord knots, nuchal cord, and cord stricture
[color=#333399]cord hematoma, cord cysts, and cord varix
[color=#333399]hemangiomas and teratomas
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