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Oyelese et al. found that 2/3 of patient with vasa previa at delivery had a low-lying placenta or placenta previa that resolved prior to the time of delivery. There are three types of vasa previa. Types 1 and 2 were described by Catanzarite et al. In Type 1, there is a velamentous insertion with vessels running over the cervix.
It is used to differentiate whether the blood coming out of vagina is of the mother or fetus during delivery i.e, placenta previa versus vasa previa. It is based on the principle that fetal HbF is resistant to acids and alkali whereas the mother's blood which has HbA is sensitive to acid and alkaline.
644.1 Other threatened labor; 644.2 Early onset of delivery; 645 Prolonged pregnancy. 645.1 Post term pregnancy; 645.2 Prolonged pregnancy; 646 Other complications of pregnancy, not elsewhere classified 646.0 Papyraceous fetus; 646.1 Edema or excessive weight gain in pregnancy without mention of hypertension
At the time of contraction or delivery the connecting placental arteries and veins may rupture resulting in significant haemorrhaging. Incidences of vasa previa and haemorrhaging in the presence of a succenturiate placenta are highly increased. [21] Fetal blood (can be distinguished with Apt test)
Normal umbilical cord insertion and velamentous umbilical cord insertion in pregnancy, with and without vasa previa. Specialty: Obstetrics Symptoms: Blood vessel compression, [1] [2] decrease in blood supply to the fetus, [2] [3] impaired growth and development of the fetus. [4] [5] Risk factors
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An important risk factor for placenta accreta is placenta previa in the presence of a uterine scar. Placenta previa is an independent risk factor for placenta accreta. Additional reported risk factors for placenta accreta include maternal age and multiparity, other prior uterine surgery, prior uterine curettage, uterine irradiation, endometrial ablation, Asherman syndrome, uterine leiomyomata ...
Umbilical cord abnormalities (vasa previa, multilobate including bilobate and succenturiate-lobed placentas, velamentous insertion) Other complications of pregnancy, pre-existing conditions, and concomitant disease, include: Previous (high risk) fetus
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