Abstract
To evaluate the effect of umbilical vein (UV) blood flow measured by color-directed pulsed-wave Doppler on perinatal outcome of fetuses with lean and/or hypocoiled umbilical cord after 24weeks of gestation. Two hundred and forty-four women with singleton fetus after 24weeks of gestation were studied. Umbilical cord area, umbilical vessel cross-sectional area and antenatal umbilical coiling index (UCI) were calculated and compared with Doppler parameters including UV blood flow volume in ml/min/kg, UV peak systolic velocity in cm/s, and umbilical artery pulsatility index. Thirty-eight (15.5%) fetuses had lean umbilical cord (area<10th percentile). A significant difference between fetuses with and those without lean cord was found in terms of: UCI (0.17±0.06 vs. 0.35±0.08, P<0.001), cord cross-sectional area (89.6±11.7 vs. 198.7±33.7mm(2), P<0.001), Wharton's jelly amount (36.5±11.2 vs. 125.2±34.1mm(2), P<0.001), UV blood flow (83.4±15.8 vs. 131.0±19.8ml/min/kg, P<0.001), and UV blood flow mean velocity (8.6±3.7 vs. 12.1±2.8cm/s, P<0.05). A significant positive correlation was found between antenatal UCI and UV blood flow (r=0.73, P<0.001). Fetuses with lean and/or hypo-coiled umbilical cord showed a noticeable decrease in UV blood flow of sufficient magnitude that could affect fetal growth, and this could explain the higher prevalence of fetal intrapartum complications in growth-restricted fetuses.
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