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The fetal circulation is composed of the placenta, umbilical blood vessels encapsulated by the umbilical cord, heart and systemic blood vessels. A major difference between the fetal circulation and postnatal circulation is that the lungs are not used during the fetal stage resulting in the presence of shunts to move oxygenated blood and ...
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A study of 32 normal pregnancies showed that fetal heart motion was visible at a mean human chorionic gonadotropin (hCG) level of 10,000 UI/L (range 8650–12,200). [19] Obstetric ultrasonography can also use Doppler technique on key vessels such as the umbilical artery to detect abnormal flow. Doppler fetal monitor
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Umbilical cord compression can result from, for example, entanglement of the cord, [16] a knot in the cord, [16] or a nuchal cord, [16] (which is the wrapping of the umbilical cord around the fetal neck) [17] but these conditions do not always cause obstruction of fetal circulation. Velamentous cord insertion; Single umbilical artery; Umbilical ...
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