Resolution of a Low-Lying Placenta and Placenta Previa Diagnosed at the Midtrimester Anatomy Scan
Autor: | Jennifer K. Durst, Methodius G. Tuuli, Jeffrey M. Dicke, Owen Hamilton, Lorene A. Temming |
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Rok vydání: | 2019 |
Předmět: | |
Zdroj: | Obstetrical & Gynecological Survey. 74:12-13 |
ISSN: | 1533-9866 0029-7828 |
Popis: | OBJECTIVES To identify the incidence and resolution rates of a low-lying placenta or placenta previa and to assess the optimal time to perform follow-up ultrasonography (US) to assess for resolution. METHODS We conducted a retrospective cohort study of women with a diagnosis of a low-lying placenta or placenta previa at routine anatomic screening. Follow-up US examinations were reviewed to estimate the proportion of women who had resolution. A Kaplan-Meier survival curve was generated to estimate the median time to resolution. The distance of the placental edge from the internal cervical os was used to categorize the placenta as previa or low-lying (0.1-10 or ≥ 10-20 mm). A time-to-event analysis was used to estimate predictive factors and the time to resolution by distance from the os. RESULTS A total of 1663 (8.7%) women had a diagnosis of a low-lying placenta or placenta previa. The cumulative resolution for women who completed 1 or more additional US examinations was 91.9% (95% confidence interval, 90.2%-93.3%). The median time to resolution was 10 (interquartile range [IQR], 7-13) weeks. The distance from the internal cervical os was known for 658 (51.0%) women. The probability of resolution was inversely proportional to the distance from the internal os: 99.5% (≥10-20 mm), 95.4% (0.1-10 mm), and 72.3% (placenta previa; P |
Databáze: | OpenAIRE |
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