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Studies on Fetal Bradycardia During Birth Process

II

From the Research Department and the Departments of Anesthesia and Pediatrics at Maternidad Concepcion Palacios, Caracas, Venezuela.

In a group of cases that showed normal FUR during labor, normal scalp blood pH values, and no cord entanglement at delivery, important biochemical changes were observed in the blood of the umbilical vessels when fetal bradycardia accompanying the birth process was exceedingly prolonged. The pH of the blood of the umbilical artery fell, while that of the blood of the umbilical vein remained virtually unchanged; consequently the venous-arterial pH difference increased. No such changes were seen if birth bradycardia was of short duration. The importance of careful supervision of the fetus in the last phase of labor and of obstetric intervention to shorten expulsion is stressed.