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- Title
Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study.
- Authors
Hasegawa, Junichi; Kawabata, Ikuno; Takeda, Yoshiharu; aoki, Hiroaki; Fukami, Takehiko; Tajima, atsushi; Miyakoshi, Kei; Otsuki, Katsufumi; Shinozuka, Norio; Matsuda, Yoshio; Iwashita, Mitsutoshi; Okai, Takashi; Nakai, akihito
- Abstract
<bold>Objective: </bold>To clarify whether distinguishing between the uterine isthmus and cervix can improve the accuracy of diagnosing placenta previa at term.<bold>Methods: </bold>A multicenter prospective observational study was conducted among pregnant women with suspected placenta previa at 20-24 weeks' gestation. Subjects were divided into the open isthmus group and closed isthmus group. The accuracy of diagnosing placenta previa at term was compared between the 2 groups.<bold>Results: </bold>We screened 9,341 patients, and 53 (0.6%) met the inclusion criteria. Nineteen cases with an open isthmus and 34 with a closed isthmus were followed. The accuracy for diagnosing placenta previa or a low-lying placenta at term was 94.7% in the open isthmus group and 26.5% in the closed isthmus group (p < 0.001). Elective or emergency Cesarean section was required in 100% of cases in the open isthmus group and 20.6% in the closed isthmus group (p < 0.001).<bold>Conclusion: </bold>A high prediction rate of placenta previa was obtained by using transvaginal ultrasound at 20-24 weeks' gestation after the isthmus opened by carefully distinguishing between the cervix and isthmus.
- Subjects
TRANSVAGINAL ultrasonography; PLACENTA praevia; CERVIX uteri disease diagnosis; PREGNANCY complications; CESAREAN section; DIAGNOSIS
- Publication
Fetal Diagnosis & Therapy, 2017, Vol 41, Issue 2, p145
- ISSN
1015-3837
- Publication type
journal article
- DOI
10.1159/000446212