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OBJECTIVE: Estimate the incidence of placenta accreta and describe risk factors, clinical practice and perinatal outcomes. DESIGN: Case-control study. SETTING: Sites in Australia and New Zealand with at least 50 births per year. PARTICIPANTS: Cases were women giving birth (≥20 weeks or fetus ≥400 g) who were diagnosed with placenta accreta by antenatal imaging, at operation or by pathology specimens between 2010 and 2012. Controls were two births immediately prior to a case. A total of 295 cases were included and 570 controls. METHODS: Data were collected using the Australasian Maternity Outcomes Surveillance System. PRIMARY AND SECONDARY OUTCOME MEASURES: Incidence, risk factors (eg, prior caesarean section (CS), maternal age) and clinical outcomes of placenta accreta (eg CS, hysterectomy and death). RESULTS: The incidence of placenta accreta was 44.2/100 000 women giving birth (95% CI 39.4 to 49.5); however, this may overestimated due to the case definition used. In primiparous women, an increased odds of placenta accreta was observed in older women (adjusted OR (AOR) women≥40 vs <30: 19.1, 95% CI 4.6 to 80.3) and current multiple birth (AOR: 6.1, 95% CI 1.1 to 34.1). In multiparous women, independent risk factors were prior CS (AOR ≥2 prior sections vs 0: 13.8, 95% CI 7.4 to 26.1) and current placenta praevia (AOR: 36.3, 95% CI 14.0 to 93.7). There were two maternal deaths (case fatality rate 0.7%).Women with placenta accreta were more likely to have a caesarean section (AOR: 4.6, 95% CI 2.7 to 7.6) to be admitted to the intensive care unit (ICU)/high dependency unit (AOR: 46.1, 95% CI 22.3 to 95.4) and to have a hysterectomy (AOR: 209.0, 95% CI 19.9 to 875.0). Babies born to women with placenta accreta were more likely to be preterm, be admitted to neonatal ICU and require resuscitation.

Original publication

DOI

10.1136/bmjopen-2017-017713

Type

Journal article

Journal

BMJ Open

Publication Date

05/10/2017

Volume

7

Keywords

c-section, caesarean, placenta accreta, placentation, Adult, Australia, Case-Control Studies, Cesarean Section, Female, Humans, Incidence, Logistic Models, Maternal Age, Middle Aged, Multivariate Analysis, New Zealand, Parity, Placenta Accreta, Placenta Previa, Pregnancy, Pregnancy Outcome, Pregnancy, Multiple, Risk Factors, Young Adult