Diagnosis of low‐lying placenta: can migration in the third trimester predict outcome?
Open accessAbstract
Objectives: To investigate the relationship between the rate of migration of a low‐lying placenta during the third trimester and the eventual route of delivery. Methods: All patients with a placenta lying within 3 cm of the internal cervical os or overlapping it on transvaginal ultrasound at ≥ 26 weeks' gestation were included in the study. The exact distance between the center of the internal cervical os and the leading edge of the placenta was measured by transvaginal sonography, repeated at approximately 4‐week intervals until delivery. Results: The mean rates of migration in patients who had (n = 7) and who did not have (n = 29) Cesarean section for placenta previa were +0.3 mm/week and +5.4 mm/week, respectively (P < 0.0001). When the placental edge was initially > 20 mm from the internal os, migration occurred in all cases and no Cesarean section for placenta previa was performed. For those between −20 mm and +20 mm, sufficient migration to avoid Cesarean section occurred in 88.5% of cases. Beyond a 20 mm overlap, significant placental migration did not occur and all patients required Cesarean section. Conclusion: Placental migration may occur progressively throughout the third trimester. The initial position of the placental edge and the subsequent rate of migration can be used to predict the eventual route of delivery. Copyright © 2001 International Society of Ultrasound in Obstetrics and Gynecology
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'Migration' of placenta praevia is still possible after 32 weeks of gestation.
“However, 'migration' is still possible after 32 weeks of gestation.50,51”
From Placenta Praevia and Placenta Accreta: Diagnosis and Management: Green‐top Guideline No. 27a (2019) · cites this paper as [51]
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- Authors
- Oppenheimer, L., Holmes, P., Simpson, N., & Dabrowski, A.
- Affiliations
- University of Ottawa (CA)
- Ottawa Hospital (CA)
- Corresponding author
- Oppenheimer, L.
- Venue
- Ultrasound in Obstetrics & Gynecology
- Publisher
- Wiley
- Published
- 2001-08
- Volume
- 18
- Issue
- 2
- Pages
- 100-102
- ISSN
- 0960-7692 (ISSN-L)
- 1469-0705
- OpenAlex
- W2003337149
- Cited by
- 102
- References
- 19
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 6 · 2020: 3 · 2019: 4 · 2018: 7 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 5 · 2013: 1 · 2012: 8
- FWCI
- 3.00
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Ultrasound in Obstetrics and Gynecology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Maternal and fetal healthcare
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
- Keywords
- low-lying placenta, placental migration, placenta previa, third trimester, cesarean section, transvaginal ultrasound, internal cervical os
- MeSH terms
- Adult, Female, Humans, Placenta Previa, Pregnancy, Pregnancy Trimester, Second, Ultrasonography, Prenatal
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