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 B
Explanation
Choice A rationale
The presenting part being 2 cm below the ischial spines would be documented as +2 station, indicating that the fetal head is descending well into the pelvis.
Choice B rationale
The presenting part being 2 cm above the ischial spines is correctly documented as -2 station. This indicates that the fetal head is still relatively high in the pelvis and has not yet descended to the level of the ischial spines.
Choice C rationale
The presenting part being at the level of the ischial spines is documented as 0 station. This is the midpoint of the pelvis and indicates that the fetal head is engaged.
Choice D rationale
The presenting part being 2 cm below the cervix is not a standard way to describe fetal station. Station is measured relative to the ischial spines, not the cervix.
Correct Answer is B
Explanation
Choice A rationale
Encouraging the client to walk around for 30 minutes and then resume monitoring is not the most appropriate action in this scenario. Walking may help stimulate fetal movement, but it is not the first-line intervention when there are no accelerations or fetal movement during a nonstress test. The nurse should try other methods to stimulate fetal movement before resorting to walking.
Choice B rationale
Performing vibroacoustic stimulation is the correct action. Vibroacoustic stimulation involves using a device to produce a sound and vibration near the maternal abdomen to stimulate fetal movement and heart rate accelerations. This method is non-invasive and can help determine fetal well-being by eliciting a response from the fetus.
Choice C rationale
Immediately reporting the situation to the provider and preparing the client for induction of labor is premature. The absence of accelerations or fetal movement during a nonstress test does not immediately indicate a need for induction of labor. Other less invasive interventions, such as vibroacoustic stimulation, should be attempted first.
Choice D rationale
Repositioning the client into a supine position is not recommended. The supine position can lead to supine hypotensive syndrome, which can decrease blood flow to the fetus. The nurse should avoid placing the client in a supine position and instead try other methods to stimulate fetal movement.