Systematic ReviewsPrevalence and main outcomes of placenta accreta spectrum: a systematic review and meta-analysis
Section snippets
Eligibility criteria, information sources and search strategy
We undertook a PubMed, Google Scholar, clinicalTrials.gov, and MEDLINE search for studies published in any language between the first prenatal ultrasound description of placenta accreta in July 1982 by Tabsh et al24 and April 1, 2018. The search protocol was designed a priori and registered on PROSPERO (CRD42017068589; www.crd.york.ac.uk/PROSPERO) in line with current recommendations and reported as per PRISMA 2009 guidelines (www. prisma-statement.org). We used MeSH headings, text words, and
Results
From 2170 citations that were identified, we included 29 population studies from 13 different countries for the quantitative analysis (Figure 1).
Principal findings of the study
Our findings have quantified the variability between population studies in the prevalence of placenta accreta spectrum at birth. There was strong evidence of inconsistency between the different types of population studies with regards to the criteria that are used to diagnose and/or confirm the condition at delivery. The meta-analysis found large amounts of heterogeneity for the incidence of peripartum hysterectomy and for hemorrhage that requires transfusion and moderate amounts for maternal
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No funding was obtained for this study. C.B.’s post is partly funded/supported by the National Institute for Health Research (NIHR) Biomedical Research Centre based at Guy's and St Thomas’ NHS Foundation Trust and King's College London. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR, or the Department of Health.
The authors report no conflict of interest.