Brady K, Duff P, Read J A, Harlass F E
Division of Maternal-Fetal Medicine, Madigan Army Medical Center, Tacoma, Washington.
Obstet Gynecol. 1989 Dec;74(6):886-8.
This prospective investigation was undertaken to compare fetal buttock capillary blood pH and umbilical artery and vein pH in fetuses presenting by the breech. The study group comprised ten term patients with singleton fetuses in the frank breech presentation who met established criteria for vaginal breech delivery. All patients had a normal labor pattern. Eight fetuses had a normal fetal heart rate tracing and two had severe variable decelerations during the second stage of labor. We obtained capillary blood for pH measurement from the fetal buttock within 15 minutes of delivery. Immediately after delivery, we collected arterial and venous blood samples from the umbilical cord for measurement of pH. In all fetuses, there was a highly significant correlation between fetal buttock capillary blood pH and umbilical artery pH (r = 0.96; P less than .001) and umbilical vein pH (r = 0.88; P less than .001). We conclude that measurement of pH in capillary blood obtained from the fetal buttock provides accurate assessment of the acid-base status of the breech fetus.
本前瞻性研究旨在比较臀先露胎儿的臀部毛细血管血pH值与脐动脉和脐静脉pH值。研究组包括10例足月单胎臀先露胎儿患者，这些患者符合阴道臀位分娩的既定标准。所有患者产程正常。8例胎儿胎心监护正常，2例在第二产程出现重度变异减速。在分娩后15分钟内从胎儿臀部采集毛细血管血进行pH值测量。分娩后立即从脐带采集动脉和静脉血样测量pH值。在所有胎儿中，胎儿臀部毛细血管血pH值与脐动脉pH值（r = 0.96；P < .001）和脐静脉pH值（r = 0.88；P < .001）之间存在高度显著相关性。我们得出结论，测量胎儿臀部毛细血管血pH值可准确评估臀先露胎儿的酸碱状态。
