Diagnosis and Management:
Vasa previa is most commonly diagnosed when rupture of the membranes is accompanied by vaginal bleeding and fetal distress or death. However, when acute bleeding occurs from a ruptured vasa previa, emergent delivery is frequently indicated, and there may be no time to test for fetal blood cells. Numerous reports and studies have demonstrated that vasa previa can be diagnosed prenatally with ultrasonography (9). When a color or power Doppler is used, flow can be demonstrated through these vessels, and pulsed Doppler will demonstrate a fetal umbilical arterial or venous waveform. It is important to differentiate a vasa previa from a funic presentation. In the latter, the vessels will move when the patient changes position, especially when the patient is placed in the Trendelenburg position. Conversely, the vessels do not move when there is a vasa previa. The majority of cases of vasa previa in asymptomatic women can be diagnosed prenatally through a policy of routinely evaluating the placental cord insertion when an ultrasound examination is performed and considering vaginal sonography with color Doppler if the placental cord insertion cannot be identified or if there is a low-lying placenta or a suspected succenturiate placental lobe. Screening for vasa previa should be routine in obstetric sonogram.
Diagnosis and Management:
Vasa previa is most commonly diagnosed when rupture of the membranes is accompanied by vaginal bleeding and fetal distress or death. However, when acute bleeding occurs from a ruptured vasa previa, emergent delivery is frequently indicated, and there may be no time to test for fetal blood cells. Numerous reports and studies have demonstrated that vasa previa can be diagnosed prenatally with ultrasonography (9). When a color or power Doppler is used, flow can be demonstrated through these vessels, and pulsed Doppler will demonstrate a fetal umbilical arterial or venous waveform. It is important to differentiate a vasa previa from a funic presentation. In the latter, the vessels will move when the patient changes position, especially when the patient is placed in the Trendelenburg position. Conversely, the vessels do not move when there is a vasa previa. The majority of cases of vasa previa in asymptomatic women can be diagnosed prenatally through a policy of routinely evaluating the placental cord insertion when an ultrasound examination is performed and considering vaginal sonography with color Doppler if the placental cord insertion cannot be identified or if there is a low-lying placenta or a suspected succenturiate placental lobe. Screening for vasa previa should be routine in obstetric sonogram.
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