The nurse preceptor is teaching about the physiology of the fetal heart rate (FHR) pattern. Which statement by the student indicates a lack of understanding?
Vagus nerve stimulation increases FHR variability.
Baroreceptors are responsible for regulating blood pressure.
The autonomic nervous system controls the FHR.
Chemoreceptors respond to changes in blood gas levels.
The Correct Answer is A
Choice A rationale
This statement is incorrect. Vagus nerve stimulation actually decreases FHR variability. The vagus nerve, part of the parasympathetic nervous system, slows the heart rate and reduces variability.
Choice B rationale
This statement is correct. Baroreceptors are sensors located in blood vessels that help regulate blood pressure by detecting changes in the stretch of the vessel walls. They play a crucial role in maintaining stable blood pressure levels.
Choice C rationale
This statement is correct. The autonomic nervous system, which includes the sympathetic and parasympathetic nervous systems, controls the fetal heart rate. It regulates the balance between heart rate acceleration and deceleration.
Choice D rationale
This statement is correct. Chemoreceptors respond to changes in blood gas levels, such as oxygen and carbon dioxide. They help regulate respiratory and cardiovascular responses to maintain homeostasis.
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Correct Answer is A
Explanation
Choice A rationale
A reactive non-stress test (NST) indicates that the fetal heart rate increases appropriately with fetal movements, suggesting good fetal oxygenation and neurological function. This is the desired outcome for an NST4.
Choice B rationale
A non-reactive NST means the fetal heart rate did not increase with movements, which could indicate fetal hypoxia or other issues. Further testing would be needed to assess fetal well-being.
Choice C rationale
An inconclusive NST means the test did not provide enough information to determine fetal well-being, possibly due to fetal sleep cycles or maternal factors. Additional testing would be required.
Choice D rationale
A positive NST is not a standard term used in fetal monitoring. The correct terms are reactive or non-reactive.
Correct Answer is D
Explanation
Choice A rationale
Early decelerations are not caused by umbilical cord compression. Umbilical cord compression typically leads to variable decelerations, which have a different pattern and clinical significance.
Choice B rationale
Early decelerations are not caused by uteroplacental insufficiency. Uteroplacental insufficiency is associated with late decelerations, which occur after the peak of a contraction and indicate reduced blood flow to the fetus.
Choice C rationale
Early decelerations are not a result of the administration of medications. Medications can affect fetal heart rate patterns, but early decelerations are specifically related to fetal head compression.
Choice D rationale
Early decelerations are related to fetal head compression. They occur as the fetal head descends into the maternal pelvis and are generally considered benign, indicating normal labor progression.