Single umbilical artery: correlation of the prognosis and side of the missing artery

Single umbilical artery and its siding in the second trimester of pregnancy: relation to chromosomal defects

“…Similar to the results of Abuhamad et al (Abuhamad et al, 1995) (n = 77 cases) and Geipel et al (Geipel et al, 2000) (n = 102 cases), but in contrast to the studies with smaller numbers of cases by Blazer et al (1997) (n = 46 cases) and Fukada et al (Fukada et al, 1998) (n = 10 cases), which observed no differences in the distribution of the missing side, we found the absence of the left side (58.8%) was more frequent than the right (41.2%). Absent left umbilical artery was more common in fetuses of both groups: chromosomally normal (59%) and chromosomally abnormal (58%).…”

Prenatally Diagnosed Single Umbilical Artery (SUA) – Retrospective Analysis of 1169 Fetuses

“…We analyzed 1169 individuals diagnosed with SUA by prenatal ultrasound during the 2 nd and 3 rd trimester scan and found a single right umbilical artery (RUA) in 64.2 % of the cases and a single left umbilical artery (LUA) in 35.9 % of the cases. While older studies with small patient numbers showed no difference in distribution [14,15], recent publications on larger cohorts found similar allocations in favor of a persistent RUA [12,16]. The malformation rate (structural and/or chromosomal) of 15.4 % among our fetuses with SUA was rather low compared to the incidence rates of 13 -50 % reported in the literature [9,12,14,17].…”

Prenatal diagnosis of single umbilical artery: determination of the absent side, associated anomalies, Doppler findings and perinatal outcome

“… 15 ( n = 46 cases) and Fukada et al . 16 ( n = 10 cases) which observed no differences in the distribution of the missing side, we found the absence of the left side (69.6%) was more frequent than the right (30.4%). We have no explanation for this finding.…”