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Prenatal detection of placenta previa and placenta accreta spectrum: Evaluation of the routine mid‐pregnancy obstetric ultrasound screening between 2013 and 2017
Author(s) -
Svanvik Teresia,
Jacobsson AnnaKarin,
Carlsson Ylva
Publication year - 2022
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1002/ijgo.13876
Subject(s) - placenta previa , medicine , obstetrics , placenta accreta , pregnancy , odds ratio , placenta , gynecology , placenta diseases , cohort , cohort study , fetus , genetics , biology
Objective To examine the detection rate of placenta previa and placenta accreta spectrum (PAS) by routine mid‐pregnancy obstetric ultrasound and to estimate risk factors and prevalence within this cohort. Methods This was an observational cohort study with prospectively collected data. Women attending routine mid‐pregnancy obstetric ultrasound at the Sahlgrenska University Hospital with a suspected cup‐shaped placenta (cohort 1, n = 339) and women diagnosed with placenta previa or PAS (cohort 2, n = 227) were analyzed according to detection rate, risk factors, and prevalence. Results The detection rates of placenta previa and PAS were 49% (98) and 25% (14), respectively. However, 216 (99%) women with placenta previa were diagnosed prenatally, as were 14 (50%) women with PAS. In vitro fertilization was identified as the strongest independent risk factor for placenta previa (odds ratio 6.96; 95% confidence interval 4.77–10.16, P < 0.001). Risk factors were present for all women with PAS. The prevalence of placenta previa was 44/10 000 deliveries, and for PAS, 5.6/10 000 deliveries. Conclusion The existing routine mid‐pregnancy obstetric ultrasound screening showed low detection rate for placenta previa and PAS. Adding risk factors could improve the detection rate.