Cited by 102Maternal and fetal healthcareMaternal and Perinatal Health InterventionsPregnancy and preeclampsia studies

Diagnosis of low‐lying placenta: can migration in the third trimester predict outcome?

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Oppenheimer, L., Holmes, P., Simpson, N., Dabrowski, A.·2001·Ultrasound in Obstetrics & Gynecology

Abstract

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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Crossref · 10.1046/j.1469-0705.2001.00450.x

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  1. [5]5. McClure N, Dornan JC. Early identification of placenta previa. Br J Obstet Gynaecol 1990; 97: 959 -61

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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
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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