Shanklin D Radford, Zhang Jie
Department of Pathology and Laboratory Medicine, University of Tennessee Health Sciences Center, 930 Madison Avenue, Suite 599, Memphis, TN 38163, USA.
J Reprod Med. 2007 Jun;52(6):529-32.
The respiratory, metabolic and excretory functions of the placenta provide maintenance of fetuses in utero even in the presence of severe malformations that preclude postnatal survival.
A 17-year-old secundigravida delivered a 1,075-g liveborn in the 30th week of gestation. The infant was severely malformed, with gastroschisis and a short umbilical cord, and survived for 62 minutes after birth. The placenta was examined pathologically, and a complete an autopsy was performed. The cord measured 13.0 cm long, the limit for absolute shortness. An 8.0-cm segment was found to contain only 1 umbilical vessel, basically a vein, with segmental arterial pads.
The concurrence in a liveborn infant of malformations so severe it could not be sustained, a segment of umbilical cord with only 1 vessel and postnatal survival of 62 minutes emphasizes the biologic distinction between existence and vitality.
胎盘的呼吸、代谢和排泄功能即使在存在严重畸形导致出生后无法存活的情况下，也能维持子宫内胎儿的生命。
一名17岁经产妇在妊娠第30周分娩出一名体重1075克的活产婴儿。该婴儿严重畸形，患有腹裂和短脐带，出生后存活了62分钟。对胎盘进行了病理检查，并进行了完整的尸检。脐带长度为13.0厘米，为绝对短脐带的极限。发现一段8.0厘米长的脐带仅含有1条脐血管，基本上是一条静脉，并伴有节段性动脉垫。
一名活产婴儿同时存在严重到无法维持生命的畸形、一段只有1条血管的脐带以及出生后存活62分钟，这强调了存在与活力之间的生物学差异。
