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
Dizziness can be a side effect of epidural anesthesia, but it is not as critical as hypotension. It should be monitored, but it does not require immediate reporting unless it is severe or accompanied by other symptoms.
Choice B rationale
Blood pressure of 88/52 mmHg indicates hypotension, which is a common and potentially serious side effect of epidural anesthesia. Hypotension can lead to decreased placental perfusion and fetal distress, so it requires immediate attention and reporting to the anesthesia provider.
Choice C rationale
A pain level of 1 on a 0 to 10 scale indicates that the epidural is effectively managing the client’s pain. This is a positive outcome and does not require reporting.
Choice D rationale
A pulse of 88 bpm is within the normal range for an adult and does not indicate any immediate concern that needs to be reported to the anesthesia provider.
Correct Answer is C
Explanation
Choice A rationale
While a negative result in a Contraction Stress Test (CST) is desirable, this choice does not fully explain the significance of the result. A negative CST indicates that there are no late decelerations in the fetal heart rate in response to uterine contractions, suggesting that the fetus can handle the stress of labor.
Choice B rationale
This choice describes the criteria for a reactive Nonstress Test (NST), not a Contraction Stress Test (CST). In a CST, the focus is on the fetal heart rate response to contractions, not the number of contractions or variability.
Choice C rationale
A negative result in a CST indicates fetal well-being, meaning that the fetus can tolerate the stress of uterine contractions without showing signs of distress, such as late decelerations in the heart rate. This result suggests that the fetus is likely to handle labor well.
Choice D rationale
A positive result in a CST indicates that the fetus has late decelerations in response to contractions, which can be a sign of fetal distress. This result may suggest fetal growth restriction, lower Apgar scores, and the potential need for cesarean delivery. However, this choice does not fully capture the significance of a positive CST result.