Philip A G, Teng S S
Biol Neonate. 1977;31(3-4):219-24. doi: 10.1159/000240963.
The transfer of blood from placenta to baby (placental transfusion) was examined in 29 full-term babies delivered by elective Cesarean Section. Events surrounding the delivery were carefully monitored using a stopwatch. Residual placental blood volume (RPBV) and change in hematocrit (Hct) were measured. In 13 infants held above the level of the placenta, the mean RPBV was significantly greater, and the change in Hct significantly lower, than in 16 infants held below the level of the placenta. Increasing duration of respiration resulted in increasing amounts of placental transfusion, even in those babies held just above the placenta. These results indicate that there are separate effects of gravity and respiration which facilitate a placental transfusion at Cesarean Section.
对29例择期剖宫产分娩的足月儿进行了胎盘至婴儿的输血（胎盘输血）研究。使用秒表仔细监测分娩过程中的各项事件。测量了残余胎盘血量（RPBV）和血细胞比容（Hct）的变化。在13例出生时被放置在胎盘水平以上的婴儿中，其平均残余胎盘血量显著更高，而血细胞比容的变化显著低于16例出生时被放置在胎盘水平以下的婴儿。即使是那些出生时仅被放置在胎盘上方的婴儿，呼吸持续时间的增加也会导致胎盘输血量增加。这些结果表明，重力和呼吸有各自独立的作用，它们有助于剖宫产时的胎盘输血。
