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Asynclitic birth
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,〔(Asynclitism ), spinningbabies.com〕 causing the fetal head to no longer be in line with the birth canal.〔(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.〕 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 sometimes, though not necessarily, be achieved through movement and positioning of the birthing woman, and patience and extra time to allow for movement of the baby through the pelvis and moulding of the skull during the birthing process if this is safe in the circumstances.〔
Where intervention is the safest option in asynclitic birth, Kielland forceps are preferable obstetric forceps used in asynclitic births, for example by their sliding mechanism, availing for more appropriate adjustment of the blades.〔
==See also==
*Pelvimetry, the assessment of the female pelvis in relation to the birth of a baby
*Childbirth
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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