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  • Title: Heart rate cyclicity during labor in healthy term fetuses.
    Author: Petrikovsky BM, Vintzileos AM, Nochimson DJ.
    Journal: Am J Perinatol; 1989 Jul; 6(3):289-91. PubMed ID: 2730733.
    Abstract:
    Fifty-four intrapartum fetal heart rate (FHR) tracing were subjected to retrospective analysis of the presence, length, and frequency of cyclic changes in long-term variability (cyclicity). All patients had spontaneous uncomplicated labor and received no narcotics or analgesics. The following cycles were identified according the difference in long-term variability in terms of amplitude range: cycle A, 0 to 2.5 beats/min; cycle B, 3 to 5 beats/min; cycle C, 6 to 10 beats/min; and cycle D, 11 to 20 beats/min. The frequency and length of FHR cycles was established in the latent, active phases and second stage of labor. Periods of diminished variability should be followed by fetal acid-base assessment only if their duration exceeds the established norms.
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