Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study

Junichi Hasegawa; Ikuno Kawabata; Yoshiharu Takeda; Hiroaki Aoki; Takehiko Fukami; Atsushi Tajima; Kei Miyakoshi; Katsufumi Otsuki; Norio Shinozuka; Yoshio Matsuda; Mitsutoshi Iwashita; Takashi Okai; Akihito Nakai

doi:10.1159/000446212

Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study

Junichi Hasegawa, Ikuno Kawabata, Yoshiharu Takeda, Hiroaki Aoki, Takehiko Fukami, Atsushi Tajima, Kei Miyakoshi, Katsufumi Otsuki, Norio Shinozuka, Yoshio Matsuda, Mitsutoshi Iwashita, Takashi Okai, Akihito Nakai

Department of Obstetrics and Gynecology (Obstetrics)

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Objective: To clarify whether distinguishing between the uterine isthmus and cervix can improve the accuracy of diagnosing placenta previa at term. Methods: 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. Results: 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). Conclusion: 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.

Original language	English
Pages (from-to)	145-151
Number of pages	7
Journal	Fetal Diagnosis and Therapy
Volume	41
Issue number	2
DOIs	https://doi.org/10.1159/000446212
Publication status	Published - 2017 Mar 1

Keywords

Low-lying placenta
Placenta migration
Placenta previa
Ultrasound
Uterine cervix
Uterine isthmus

ASJC Scopus subject areas

Pediatrics, Perinatology, and Child Health
Embryology
Radiology Nuclear Medicine and imaging
Obstetrics and Gynaecology

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10.1159/000446212

Cite this

Hasegawa, J., Kawabata, I., Takeda, Y., Aoki, H., Fukami, T., Tajima, A., Miyakoshi, K., Otsuki, K., Shinozuka, N., Matsuda, Y., Iwashita, M., Okai, T., & Nakai, A. (2017). Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study. Fetal Diagnosis and Therapy, 41(2), 145-151. https://doi.org/10.1159/000446212

Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study. / Hasegawa, Junichi; Kawabata, Ikuno; Takeda, Yoshiharu et al.
In: Fetal Diagnosis and Therapy, Vol. 41, No. 2, 01.03.2017, p. 145-151.

Research output: Contribution to journal › Article › peer-review

Hasegawa, J, Kawabata, I, Takeda, Y, Aoki, H, Fukami, T, Tajima, A, Miyakoshi, K, Otsuki, K, Shinozuka, N, Matsuda, Y, Iwashita, M, Okai, T & Nakai, A 2017, 'Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study', Fetal Diagnosis and Therapy, vol. 41, no. 2, pp. 145-151. https://doi.org/10.1159/000446212

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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",

abstract = "Objective: To clarify whether distinguishing between the uterine isthmus and cervix can improve the accuracy of diagnosing placenta previa at term. Methods: 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. Results: 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). Conclusion: 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.",

keywords = "Low-lying placenta, Placenta migration, Placenta previa, Ultrasound, Uterine cervix, Uterine isthmus",

author = "Junichi Hasegawa and Ikuno Kawabata and Yoshiharu Takeda and Hiroaki Aoki and Takehiko Fukami and Atsushi Tajima and Kei Miyakoshi and Katsufumi Otsuki and Norio Shinozuka and Yoshio Matsuda and Mitsutoshi Iwashita and Takashi Okai and Akihito Nakai",

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AU - Hasegawa, Junichi

AU - Kawabata, Ikuno

AU - Takeda, Yoshiharu

AU - Aoki, Hiroaki

AU - Fukami, Takehiko

AU - Tajima, Atsushi

AU - Miyakoshi, Kei

AU - Otsuki, Katsufumi

AU - Shinozuka, Norio

AU - Matsuda, Yoshio

AU - Iwashita, Mitsutoshi

AU - Okai, Takashi

AU - Nakai, Akihito

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N2 - Objective: To clarify whether distinguishing between the uterine isthmus and cervix can improve the accuracy of diagnosing placenta previa at term. Methods: 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. Results: 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). Conclusion: 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.

AB - Objective: To clarify whether distinguishing between the uterine isthmus and cervix can improve the accuracy of diagnosing placenta previa at term. Methods: 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. Results: 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). Conclusion: 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.

KW - Low-lying placenta

KW - Placenta migration

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KW - Ultrasound

KW - Uterine cervix

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Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study

Abstract

Keywords

ASJC Scopus subject areas

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