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- W2091559472 abstract "A 30-year-old primigravida presented for ultrasound and Doppler evaluation for loss of fetal movements. The ultrasound showed a normal 36 weeks fetus with a single loop of nuchal cord, with umbilical artery and other Doppler flows within normal limits for gestational age. The liquor was adequate (deepest vertical pocket—5 cm). On tracing the cord for Doppler interrogation, a cross-section of the cord was seen surrounded by a complete loop of cord raising suspicion of a true knot of the cord. The suspicion was confirmed by acquiring three dimensional high definition power Doppler volume and rotating it along x and y axis and displaying it in angiographic and glass body modes [1, 2] (Fig. 1). The fetus was delivered two days later by cesarean section for nonreassuring heart rate, and a healthy male fetus weighing 2510 g was delivered. The true knot of the cord was confirmed at 20 cm from the placental end of a 64 cm long cord (Fig. 2). True knot of the cord is relatively rare and is found in 0.3–2.1 % of pregnancies [3] but is important to diagnose as it is associated with a fourfold increase in fetal death rate, nonreassuring heart rate patterns, and cesarean delivery. Other factors associated with true knot of the cord include polyhydramnios, gestational diabetes, male fetus, amniocentesis, long cord and small fetus [3]. Notching in the umbilical artery waveform has been demonstrated and correlated with cord compression in fetuses with true knot of the cord. Stenotic effect of the true knot on umbilical venous blood flow was demonstrated by Gembruch et al. in a mid-trimester ultrasound [4, 5]. Prenatal diagnosis of true umbilical cord knot has been random and the true impact of this condition on neonatal outcomes is yet to be evaluated. However, prenatal diagnosis of true knot of umbilical cord should warrant closer Fig. 1 3D power Doppler angiogram showing true knot of the cord Fig. 2 True knot of the cord" @default.
- W2091559472 created "2016-06-24" @default.
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- W2091559472 date "2014-12-01" @default.
- W2091559472 modified "2023-09-25" @default.
- W2091559472 title "True Knot of the Umbilical Cord—3D Power Doppler Imaging" @default.
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- W2091559472 doi "https://doi.org/10.1007/s40556-015-0028-0" @default.
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