Flenady V, Koopmans L, Middleton P, Froen JF, Smith GC, Gibbons K, et al. Major risk factors for stillbirth in high-income countries: a systematic review and meta-analysis. Lancet. 2011;377:1331–40.Web of ScienceCrossrefPubMedGoogle Scholar
Kamiya K, editor. Maternal and child health statistics in Japan. Tokyo: Mothers’ and Children’s Health and Welfare Association; 2015.Google Scholar
Takita H, Hasegawa J, Arakaki T, Nakamura M, Hamada S, Tokunaka M, et al. Usefulness of antenatal ultrasound fetal morphological assessments in the first and second trimester: a study at a single Japanese university hospital. J Med Ultrasonics. 2016;43:57–62.CrossrefWeb of ScienceGoogle Scholar
Qin J, Liu X, Sheng X, Wang H, Gao S. Assisted reproductive technology and the risk of pregnancy-related complications and adverse pregnancy outcomes in singleton pregnancies: A meta-analysis of cohort studies. Fertil Steril. 2016;105:73–85 e1–6.CrossrefWeb of ScienceGoogle Scholar
Raisanen S, Georgiadis L, Harju M, Keski-Nisula L, Heinonen S. Risk factors and adverse pregnancy outcomes among births affected by velamentous umbilical cord insertion: a retrospective population-based register study. Eur J Obstet Gynecol Reprod Biol. 2012;165:231–4.Web of ScienceCrossrefPubMedGoogle Scholar
Ebbing C, Kiserud T, Johnsen SL, Albrechtsen S, Rasmussen S. Prevalence, risk factors and outcomes of velamentous and marginal cord insertions: a population-based study of 634,741 pregnancies. PLoS One. 2013;8:e70380.CrossrefPubMedWeb of ScienceGoogle Scholar
Hasegawa J, Matsuoka R, Ichizuka K, Sekizawa A, Okai T. Ultrasound diagnosis and management of umbilical cord abnormalities. Taiwan J Obstet Gynecol. 2009;48:23–7.CrossrefWeb of SciencePubMedGoogle Scholar
Skulstad SM, Rasmussen S, Iversen OE, Kiserud T: The development of high venous velocity at the fetal umbilical ring during gestational weeks 11–19. Br J Obstet Gynecol. 2001;108:248–53.Google Scholar
Hasegawa J. Studies for early identification of umbilical cord abnormalities and for managements of high risk pregnancies with them. Acta Obst Gynaec Jpn. 2008;60:1723–34.Google Scholar
Takita H, Hasegawa J, Arakaki T, Nakamura M, Tokunaka M, Oba T, et al. Antenatal ultrasound screening using check list before delivery for predicting a non-reassuring fetal status during labor. J Matern Fetal Neonatal Med. 2016:1–21. ahead of print.Web of ScienceGoogle Scholar
Hasegawa J, Mimura T, Morimoto T, Matsuoka R, Ichizuka K, Sekizawa A, et al. Detection of umbilical venous constriction by doppler flow measurement at midgestation. Ultrasound Obstet Gynecol. 2010;36:196–201.PubMedCrossrefWeb of ScienceGoogle Scholar
Predanic M, Perni SC, Chasen ST, Baergen RN, Chervenak FA. Ultrasound evaluation of abnormal umbilical cord coiling in second trimester of gestation in association with adverse pregnancy outcome. Am J Obstet Gynecol. 2005;193:387–94.PubMedCrossrefGoogle Scholar
Ananth CV, Peltier MR, Kinzler WL, Smulian JC, Vintzileos AM. Chronic hypertension and risk of placental abruption: is the association modified by ischemic placental disease? Am J Obstet Gynecol. 2007;197:273 e1–7.Web of ScienceCrossrefGoogle Scholar
About the article
Published Online: 2017-02-25
Published in Print: 2018-01-26
Conflict of interest: Authors state no conflict of interest.
Material and methods: Informed consent: Informed consent has been obtained from all individuals included in this study.
Ethical approval: The research related to human subject use has complied with all the relevant national regulations, and institutional policies, and is in accordance with the tenets of the Helsinki Declaration, and has been approved by the authors’ institutional review board or equivalent committee.
Contribution to authorship: Takita H., Hasegawa J. and Nakamura M. designed the research. All the authors collected the data. Takita H., Hasegawa J. and Arakaki T. analyzed and interpreted the data. Takita H., Hasegawa J. and Sekizawa A. drafted the manuscript. Takita H. and Hasegawa J. performed the statistical analyses.