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Takashi Okai
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Journal Articles

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

Subject Area:
Genetics , Women's and Children's Health
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, Japanese Organization of Prevention of Preterm delivery (JOPP)
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2017) 41 (2): 145–151.
https://doi.org/10.1159/000446212
Published Online: 03 May 2016
View articletitled, Improving the Accuracy of Diagnosing Placenta Previa on Transvaginal Ultrasound by Distinguishing between the Uterine Isthmus and Cervix: A Prospective Multicenter Observational Study
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Journal Articles

Localization of the Embryo in the Lower Part of the Gestational Sac at 6–7 Weeks’ Gestation Is Associated with Placenta Previa

Subject Area:
Genetics , Women's and Children's Health
Junichi Hasegawa, Takashi Mimura, Shoko Hamada, Masamitsu Nakamura, Ryu Matsuoka, Kiyotake Ichizuka, Akihiko Sekizawa, Takashi Okai
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2011) 30 (3): 203–206.
https://doi.org/10.1159/000329308
Published Online: 17 September 2011
View articletitled, Localization of the Embryo in the Lower Part of the Gestational Sac at 6–7 Weeks’ Gestation Is Associated with Placenta Previa
Open the PDF for Localization of the Embryo in the Lower Part of the Gestational Sac at 6–7 Weeks’ Gestation Is Associated with Placenta Previa in another window
Journal Articles

Development of Artificial Placenta: Oxygen Metabolism of Isolated Goat Fetuses with Umbilical Arteriovenous Extracorporeal Membrane Oxygenation

Subject Area:
Genetics , Women's and Children's Health
Nobuya Unno, Yoshinori Kuwabara, Norio Shinozuka, Kazuhiro Akiba, Takashi Okai, Shiro Kozuma, Masahiko Mizuno
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (1990) 5 (3-4): 189–195.
https://doi.org/10.1159/000263592
Published Online: 26 November 2009
View articletitled, Development of Artificial Placenta: Oxygen Metabolism of Isolated Goat Fetuses with Umbilical Arteriovenous Extracorporeal Membrane Oxygenation
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Journal Articles

Ultrasound Evaluation of the Amount of Wharton’s Jelly and the Umbilical Coiling Index

Subject Area:
Genetics , Women's and Children's Health
Minoru Kurita, Junichi Hasegawa, Takao Mikoshiba, Yuditiya Purwosunu, Ryu Matsuoka, Kiyotake Ichizuka, Akhiko Sekizawa, Takashi Okai
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2009) 26 (2): 85–89.
https://doi.org/10.1159/000238118
Published Online: 11 September 2009
View articletitled, Ultrasound Evaluation of the Amount of Wharton’s Jelly and the Umbilical Coiling Index
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Journal Articles

Intrapartum Fetal Heart Rate Pattern in Oligohydramnios

Subject Area:
Genetics , Women's and Children's Health
Junichi Hasegawa, Ryu Matsuoka, Kiyotake Ichizuka, Mihoko Kotani, Azumi Ohmori, Masamitsu Nakamura, Akihiko Sekizawa, Takashi Okai
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2008) 24 (3): 267–270.
https://doi.org/10.1159/000151674
Published Online: 02 September 2008
View articletitled, Intrapartum Fetal Heart Rate Pattern in Oligohydramnios
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Journal Articles

Umbilical Cord Insertion to the Lower Uterine Segment Is a Risk Factor for Vasa Previa

Subject Area:
Genetics , Women's and Children's Health
Junichi Hasegawa, Ryu Matsuoka, Kiyotake Ichizuka, Hiroshi Fujikawa, Akihiko Sekizawa, Takashi Okai
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2007) 22 (5): 358–360.
https://doi.org/10.1159/000103296
Published Online: 05 June 2007
View articletitled, Umbilical Cord Insertion to the Lower Uterine Segment Is a Risk Factor for Vasa Previa
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Journal Articles

A Fetus with Prader-Willi Syndrome Showing Normal Diurnal Rhythm and Abnormal Ultradian Rhythm on Heart Rate Monitoring

Subject Area:
Genetics , Women's and Children's Health
Hisahiko Hiroi, Shiro Kozuma, Naoki Hayashi, Nobuya Unno, Tomoyuki Fujii, Osamu Tsutsumi, Takashi Okai, Yuji Taketani
Journal: Fetal Diagnosis and Therapy
Fetal Diagn Ther (2000) 15 (5): 304–307.
https://doi.org/10.1159/000021026
Published Online: 04 September 2000
View articletitled, A Fetus with Prader-Willi Syndrome Showing Normal Diurnal Rhythm and Abnormal Ultradian Rhythm on Heart Rate Monitoring
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