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Nuchal cord : ウィキペディア英語版
Nuchal cord

A nuchal cord occurs when the umbilical cord becomes wrapped around the fetal neck〔(【引用サイトリンク】title=Fetus or Newborn Problems: Labor and Delivery Complications: Merck Manual Home Edition )〕 360 degrees. Nuchal cords are very common, with prevalence rates of 6% to 37%. Up to half of nuchal cords resolve before delivery.〔(【引用サイトリンク】title=Ultrasound Detection of Nuchal Cord Prior to Labor Induction and the Risk of Cesarean Section )
==Classification==

* A ''"Type A"'' nuchal cord is wrapped around the neck 360 degrees.
* A ''"Type B"'' pattern is described as a hitch which cannot be undone and ends up as a true knot.

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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