Yuen B H, Wittmann B K, Staley K
Am J Obstet Gynecol. 1977 May 15;128(2):219-21. doi: 10.1016/0002-9378(77)90693-7.
Significant arteriovenous differences in cord cyclic 3',5'-adenosine monophosphate (cAMP) levels and between the maternal plasma (MP) and each cord vessel (mean umbilical artery [UA] greater than umbilical vein [UV] greater than MP) was observed. cAMP levels were significantly higher in the umbilical cord vessels and maternal plasma after vaginal delivery than they were following delivery by elective cesarean section before the onset of labor. The higher mean cAMP levels observed after parturition appeared to be more pronounced in the fetoplacental unit than in the maternal compartment. A significant positive correlation in cAMP levels between the UA and UV was also observed.
观察到脐带中3',5'-环磷酸腺苷（cAMP）水平以及母血（MP）与各脐带血管之间存在显著的动静脉差异（平均脐动脉[UA]大于脐静脉[UV]大于MP）。经阴道分娩后，脐带血管和母血中的cAMP水平显著高于分娩发动前择期剖宫产术后的水平。分娩后观察到的较高平均cAMP水平在胎儿-胎盘单位中似乎比在母体部分更明显。还观察到UA和UV之间的cAMP水平存在显著正相关。
