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The mid-trimester placenta previa: a prospective follow-up
S Ancona1, M Chatterjee, I Rhee
1Department of Obstetrics and Gynecology, Catholic Medical Center of Brooklyn and Queens, New York, NY.
European Journal of Radiology
|May 1, 1990
Summary
Most cases of low-lying placenta in mid-pregnancy resolve by delivery, typically around 34 weeks. However, these pregnancies carry increased risks for bleeding and early delivery.
Area of Science:
- Obstetrics
- Maternal-Fetal Medicine
- Diagnostic Ultrasound
Background:
- A low-lying placenta or placenta previa diagnosed in the mid-trimester presents unique clinical considerations.
- Placental migration is a known phenomenon, but its implications require ongoing monitoring.
Purpose of the Study:
- To evaluate the resolution rate of mid-trimester low-lying placenta or placenta previa.
- To identify associated risks and outcomes for pregnancies with initially low-lying placentas.
Main Methods:
- Serial ultrasound examinations were performed on women diagnosed with low-lying placenta or placenta previa.
- Follow-up continued until delivery to assess placental position changes.
Main Results:
- Eighty percent (16/20) of women with a mid-trimester low-lying placenta showed conversion to normal implantation by delivery.
- Placental conversion most frequently occurred around 34 weeks of gestation.
- Patients with mid-trimester low-lying placenta faced higher risks of third-trimester bleeding, abruptio placentae, and cesarean delivery.
- Infants were also at increased risk for premature delivery.
Conclusions:
- Mid-trimester low-lying placenta often resolves, but requires continued ultrasound surveillance.
- These pregnancies are associated with increased maternal and fetal complications.
- Routine ultrasound monitoring is recommended for pregnancies with mid-trimester low-lying placenta or placenta previa.