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Studies on Fetal Bradycardia During Birth Process

I

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

Bradycardia is a common FHR pattern during the birth process. It starts abruptly at the time of the crowning of the fetal head and persists throughout the expulsion of the body. Bradycardia is often heralded by heart rate irregularities in the preexpulsive period. Immediately after the first respiratory movement, the neonatal heart rate rises sharply to a frequency higher than the heart rate during fetal life. Sometimes there is a short period of irregularity, depending on the irregularity of the respiratory movements. In cases of apnea, birth bradycardia continues until artificial insufflation of the lungs is performed. The clamping of the cord, immediate or delayed, performed during apnea, regular or irregular breathing, does not modify the evolution of the neonatal heart rate which is merely related to the peculiarity of the beginning of the respiratory process.