ArticleAJOG global reports2026
The migration of placenta even after 30 gestational weeks is a risk factor for postpartum hemorrhage.
Article in AJOG global reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
11 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background: Almost 10% of all pregnant women are diagnosed with placental location abnormalities (PLA), including placenta previa and low-lying placenta; however, most of PLA resolve as pregnancy process. Despite of placental migration, postpartum hemorrhage (PPH) is often experienced in those cases. The association between the timing of placental migration and the risk of PPH has remained unclear. Objective: The aim of this study is to investigate the relationship between the timing of placental migration and the PPH, and to establish a cutoff value to accurately predict the risk of PPH in cases who underwent the placental migration during course of pregnancy. Study Design: This was a retrospective cohort study using electronic medical records in Osaka University Hospital (Japan). Patients diagnosed with PLA after 22 gestational weeks using transvaginal ultrasonography were eligible for inclusion. All patients delivered at our hospital between 2009 and 2022. Focusing on the cases in which placental migration (more than 2 cm away from the internal cervical os) were observed, the association between the timing of placental migration and the PPH was investigated only in vaginal delivery using the multivariate analyses with collecting covariates that could affect the PPH. Based on the results, receiver operating characteristic curves were generated to determine the optimal cutoff for the number of weeks of placental migration to predict PPH. Results: One hundred and forty-five patients were diagnosed with PLA after 22 gestational weeks and delivered at our hospital between 2009 and 2022. Seventy-six after-placental migration cases with successful vaginal delivery were analyzed. The median gestational age of placental migration was 32 weeks, and the median amount of hemorrhage during delivery was 777 mL. PPH (500-1000 mL) occurred in 34 cases (44.7%), >1000 mL in 26 (34.2%). In the univariate analysis, a positive correlation was observed between the timing of placental migration and the amount of hemorrhage ( Conclusion: The timing of placental migration is positively correlated with the occurrence of PPH. In particular, cases in which placental migration is confirmed after 30 gestational weeks should be monitored carefully as high risk for PPH, as the risk of PPH is not eliminated.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.