Intermittent sinusoidal heart rate pattern in vagotomized fetal lambs

Article Abstract:

The stress hormone arginine vasopressin may cause a sinusoidal heart rate in a developing fetus. A sinusoidal heart rate has been associated with different types of complications and death in a developing fetus. Eleven fetal lambs were treated with low to high doses of intravenous arginine vasopressin. All had had a vagotomy, a procedure in which the nerve impulse to the heart is interrupted. Seventy-three percent of the fetuses developed a sinusoidal heart rate during treatment with a low dose of arginine vasopressin, 50% during treatment with a moderate dose and 33% during treatment with a high dose. Treatment with a low dose of arginine vasopressin caused an intermittent sinusoidal heart rate more often than a persistent sinusoidal heart rate. During an intermittent sinusoidal heart rate, significantly more sinusoidal patterns occurred during non-rapid-eye-movement sleep than during rapid-eye-movement sleep.

Measurement, Vasopressin, Vasopressins

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Two sinusoidal heart rate patterns in fetal lambs undergoing extracorporeal membrane oxygenation

Article Abstract:

A synchronized sinusoidal heart rate pattern may reveal a serious health problem in fetuses who are on extracorporeal membrane oxygenation. Extracorporeal membrane oxygenation is used to support the lungs and heart when the fetus has severe heart or lung disease. Researchers compared the health of 32 fetal lambs who developed a sinusoidal heart rate pattern while on extracorporeal membrane oxygenation. Two types of sinusoidal heart rate occurred: synchronized and reciprocal, depending on whether heart rate was synchronized with blood pressure or out-of-phase. The synchronized pattern was associated with more severe acid-base abnormalities and alterations in cerebral blood flow.

Abnormalities, Complications and side effects, Blood oxygenation, Extracorporeal, Extracorporeal membrane oxygenation

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Fetal heart rate patterns in postasphyxiated fetal lambs with brain damage

Article Abstract:

Decreased fetal heart rate variability and characteristic heart rate patterns are associated with brain damage from fetal asphyxia. Researchers induced asphyxia in fetal lambs while monitoring the heart beat and other physiological parameters, then examined the brains for asphyxia-induced damage. A loss of heart rate variability, a check-shaped heart rate pattern, and changes in the normal sinus rhythm following asphyxia, were characteristic of progressively greater damage to the brain.

United States, Fetus, Fetal heart rate monitoring, Electronic fetal monitoring, Asphyxia

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