Fetal heart rate patterns in growth-restricted fetal sheep induced by chronic fetal placental embolization

Article Abstract:

Variations in fetal heart rate (FHR) in response to low levels of oxygen may decrease over time. Researchers gradually induced 40% to 50% decreases in oxygen levels in six sheep fetuses during late pregnancy to study the effect of hypoxemia on FHR. Variations in FHR accelerations and decelerations in hypoxemic fetuses did not increase as pregnancy progressed and were 20% less than variations in control fetuses after 21 days. FHR variations did increase in control fetuses over time. Hypoxemia induced intrauterine growth restriction and placental insufficiency as well as reduced FHR variability.

Measurement, Hypoxia, Anoxia, Oxygen consumption, Oxygen consumption (Metabolism), Fetal growth retardation

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Power spectral analysis of R-R interval variability before and during the sinusoidal heart rate pattern in fetal lambs

Article Abstract:

The sinusoidal heart rate pattern sometimes seen in fetuses during heart rate monitoring may be a sign of suppressed autonomic nervous activity. This was the conclusion of researchers who used arginine vasopressin and atropine sulfate to trigger the pattern in fetal sheep.`

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Detection of a biorhythm of human fetal autonomic nervous activity by a power spectral analysis

Article Abstract:

Researchers have discovered a 12-hour and a 24-hour biological rhythm in fetuses. This was detected by power spectral analysis of heartbeats in six normal and 11 growth-restricted fetuses.

Biological rhythms, Biorhythms

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