Prenatal assessment of Wharton's jelly in umbilical cords with single artery

Objective To investigate whether the amount of Wharton's jelly in non-malfo rmed fetuses with a single umbilical artery is different front that of fetu ses with a normal umbilical cord. Methods WE evaluated patients with singleton pregnancies, non-malformed fet uses and single umbilical artery undergoing sonographic evaluation as a ges tational age ranging from 19 to 41 weeks' gestation. The cross-sessional ar eas of the umbilical cord and of the umbilical vessels were measures. The a mount of Wharton's jelly was calculated by subtracting from the total cross -sectional area of the umbilical cord the areas of the artery and of the ve in. The umbilical cord cross-sectional area, the umbilical artery and vein areas ns well as the amount of Wharton's jelly rc,ere plotted on previously published nomograms. Results Twenty-two patients met the inclusion criteria. The umbilical cord cross-sectional area was within the normal range in 20 (90.1%) cases. The u mbilical artery and vein areas were above 2 standard deviations from the me an in 20 cases and ill 11 cases (50%), respectively. The amount of Wharton' s jelly tuns below 2 standard deviations from the mean in all cases. An abn ormal insertion of the umbilical cord (marginal, velamentous) was present i n five cases (22.7%). Conclusions A reduction of Wharton's jelly is frequently present ill cases of single umbilical artery The increased perinatal morbidity and mortality observed in cases of single umbilical artery! even in the absence of congen ital or chromosomal abnormalities, could be in ears the consequence of a re duced amount of Wharton's jelly.