Randall G C
Res Vet Sci. 1982 May;32(3):278-82.
Fetal and maternal blood gas tensions, pH, packed cell volume and glucose, fructose and lactic acid concentrations were monitored during the last two days of gestation, during parturition and and the first hour after birth. Blood samples were taken by means of indwelling catheters (implanted seven to 14 days before parturition) from 12 fetuses in seven sows. All fetuses were liveborn at a mean gestational age of 113.1 days. The significant finding was that all variables in fetal blood were stable during labour and, although mild hypercapnia was present during the last three hours, no significant changes in mean values were seen until those of samples taken within 15 minutes of birth. In some fetuses, no changes were seen until after birth, while in others pH and pO2 values declined during the last hour of fetal life. Immediately after birth a rapid increase in pO2 and decrease in pCO2 followed the onset of respiration. Blood pH fell during the first 30 minutes after birth and this fall was accompanied by increasing blood lactic acid concentrations. Blood glucose concentrations rose rapidly in the first 15 minutes after birth and were maintained during the first hour despite separation of the piglets from the sow. There was a transient, but significant, increase in packed cell volume during the period from 15 minutes before to 15 minutes after birth. Maternal values for all variables measured remained virtually unchanged during delivery.
在妊娠的最后两天、分娩期间及出生后的第一小时，对胎儿和母体的血气张力、pH值、红细胞压积以及葡萄糖、果糖和乳酸浓度进行了监测。通过留置导管（在分娩前7至14天植入）从7头母猪的12只胎儿采集血样。所有胎儿均在平均胎龄113.1天时存活出生。重要的发现是，胎儿血液中的所有变量在分娩过程中保持稳定，尽管在最后三小时出现轻度高碳酸血症，但直到出生后15分钟内采集的样本，其平均值才出现显著变化。在一些胎儿中，直到出生后才出现变化，而在另一些胎儿中，pH值和pO2值在胎儿生命的最后一小时下降。出生后立即呼吸开始，pO2迅速升高，pCO2下降。出生后的前30分钟内血液pH值下降，且这种下降伴随着血液乳酸浓度的升高。出生后的前15分钟内血糖浓度迅速上升，尽管仔猪与母猪分离，但在出生后的第一小时内血糖浓度保持稳定。在出生前15分钟至出生后15分钟期间，红细胞压积有短暂但显著的增加。分娩期间，所测所有变量的母体值几乎保持不变。
