@article{oai:air.repo.nii.ac.jp:00003072,
 author = {Kameyama, Saeko and Sato, Akira and Miura, Hiroshi and Kumagai, Jin and Sato, Naoki and Shimizu, Dai and Makino, Kenichi and Terada, Yukihiro},
 issue = {2},
 journal = {Journal of Medical Ultrasonics},
 month = {},
 note = {Purpose To investigate whether transperineal ultrasound examination just after full cervical  dilatation is determined can predict the mode of delivery. Methods This was a prospective observational study of pregnant women. After full cervical  dilatation was determined by vaginal examination during labor, transperineal ultrasound was  immediately performed and the head direction (HD), progression distance (PD), and angle of  progression (AoP) were measured. The cases were divided into two groups: spontaneous vaginal  delivery and operative delivery due to failure of progression. Differences between the groups were  statistically analyzed using Student’s t-test and Fisher’s exact test. Results Of the 50 women, 42 had spontaneous vaginal deliveries and 8 had vacuum extractions. The  spontaneous delivery group had significantly higher HD, PD, and AoP values than the vacuum  extraction group. The areas under the receiver-operating characteristic curves for the prediction  of spontaneous vaginal delivery were 0.850 for HD, 0.827 for PD, and 0.783 for AoP. The optimum  cut-off points and positive predictive values were 83° and 92.9% for HD, 56 mm and 94.9% for PD,  and 146° and 94.3% for AoP, respectively. Conclusion Transperineal ultrasound examination just after full cervical dilatation was determined  was useful in predicting spontaneous vaginal delivery.},
 pages = {243--248},
 title = {Prediction of spontaneous vaginal delivery by transperineal ultrasound performed just after full  cervical dilatation is determined},
 volume = {43},
 year = {2016}
}