WordNet

the presentation during labor of the head of the fetus at an abnormal angle (同)obliquity

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/11 06:21:01」(JST)

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An asynclitic birth or asynclitism refers to the position of a baby in the uterus such that the head of the baby is presenting first and is tilted to the shoulder,^[1] causing the fetal head to no longer be in line with the birth canal.^[2] Asynclitic presentation is significantly different from a shoulder presentation, in which the shoulder is presenting first. Many babies enter the pelvis in an asynclitic presentation, and most asynclitism corrects spontaneously as part of the normal birthing process. Persistence of asynclitism can cause problems with dystocia, and has often been associated with cesarean birth. However with a skilled midwife or obstetrician a complication-free vaginal birth can be achieved through movement and positioning of the birthing woman,^[3] and patience and extra time to allow for movement of the baby through the pelvis and moulding of the skull during the birthing process.^[3]

Where intervention in the birthing process is absolutely necessary, Kielland forceps are preferable obstetric forceps used in asynclitic births, for example by their sliding mechanism, availing for more appropriate adjustment of the blades.^[2]

References

^ Asynclitism, spinningbabies.com
^ ^a ^b Healthline > Types of Forceps Used in Delivery February 2006. Reviewer: Douglas Levine, Gynecology Service/Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY.
^ ^a ^b Simkin, Penny (2011). The Labor Progress Handbook: Early Interventions to Prevent and Treat Dystocia (3rd ed.). John Wiley & Sons.

External links

Malpositions and malpresentations, World Health Organization's Managing Complications in Pregnancy and Childbirth, A guide for midwives and doctors
Siciliano G, Marchiafava G (1952). "[Asynclitic ventral shoulder presentation; two cases with deflection and epidural hemorrhage]". Monit Ostet Ginecolog (in Italian) 23 (4): 233–55. PMID 13025351.

UpToDate Contents

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1. 後頭横位 occiput transverse position
2. 正常な陣痛および分娩のメカニズム mechanism of normal labor and delivery
3. 吸引補助による手術的経膣分娩の手順 procedure for vacuum assisted operative vaginal delivery
4. 手術的経膣分娩 operative vaginal delivery
5. 陣痛のマネージメントに対する非薬理学的アプローチ nonpharmacological approaches to management of labor pain

English Journal

The smartphone use during intrapartum ultrasound: a useful tool to diagnose the persistent asynclitism and occiput posterior position before and during birth.

Malvasi A1,2, Tinelli A2,3.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Nov;29(21):3488-9. doi: 10.3109/14767058.2015.1135118. Epub 2016 Feb 26.
PMID 26788834

Intrapartum sonographic diagnosis of posterior asynclitism by two-dimensional transperineal ultrasound.

Ghi T1, Dall'Asta A2, Kiener A1, Volpe N1, Suprani A1, Frusca T1.
Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.Ultrasound Obstet Gynecol.2016 Sep 13. doi: 10.1002/uog.17302. [Epub ahead of print]
PMID 27619356

Persistent occiput posterior position associated to asynclitism, solved by manual rotation: is always possible to perform safely this maneuver?

Malvasi A1,2, Tinelli A3,4.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians.J Matern Fetal Neonatal Med.2016 Sep 9:1-2. [Epub ahead of print]
PMID 27609143

Japanese Journal

分娩機轉,殊に兒頭骨盤内進入機序解明に關する研究 : 主として歪軸定位に就いて

廣瀬正彦
日本産科婦人科學會雜誌 10(9), 1203-1213, 1958-08-01
NAID 110002131018

Related Pictures

Fig. 24.2 Posterior asynclitism of the Anterior asynclitism Clipart - Labor, asynclitism. Fotosearch Abnormal Presentation and asynclitism. A,Anterior asynclitism Asynclitism is a normal part of the birth Fetus as passenger 2 at University of