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Vasa previa: clinical presentations, outcomes, and implications for management
Richard Bronsteen1, Amy Whitten, Mamtha Balasubramanian
1Department of Obstetrics and Gynecology and Research Institute, William Beaumont Hospital, Royal Oak, Michigan; and the Departments of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan, Baylor College of Medicine, Houston, Texas, and the University of Rochester, Rochester, New York.
Vasa previa, a condition where fetal blood vessels cross the cervix, can be diagnosed with transvaginal ultrasound. While preterm bleeding is common, emergent delivery is rare, especially in singleton pregnancies.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Diagnostic Imaging
Background:
- Vasa previa is a rare but serious obstetric complication.
- It involves fetal blood vessels running near or over the internal cervical os.
Purpose of the Study:
- To review the diagnosis, clinical associations, and outcomes of vasa previa.
- To evaluate the effectiveness of diagnostic methods and identify risk factors.
Main Methods:
- Retrospective review of 60 vasa previa cases from 1990 to 2010.
- Analysis of diagnostic methods, associated placental and cord abnormalities, and pregnancy outcomes.
Main Results:
- 56 of 60 cases were diagnosed prenatally, primarily via transvaginal ultrasound.
- Abnormal cord insertion or placental location was noted in 55 cases.
- Preterm bleeding occurred in 42% of cases; emergent delivery was required in 7 cases, leading to neonatal morbidity and mortality. Twin pregnancies had earlier delivery (32 weeks) and higher emergent delivery rates (28.6%) compared to singletons (35 weeks, 4.1%).
Conclusions:
- Transvaginal ultrasound is effective in diagnosing vasa previa in at-risk patients.
- Preterm bleeding does not typically necessitate immediate delivery.
- While singleton pregnancies had a low rate of emergent preterm delivery, twin pregnancies were delivered significantly earlier.
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