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
Providing ice chips or mouth swabs can help keep the client comfortable and hydrated, but it is not the priority action when administering pain medication.
Choice B rationale
Assessing and documenting maternal vital signs and fetal heart rate after administering Fentanyl is crucial. This ensures that the medication is not causing any adverse effects on the mother or fetus and that both are stable.
Choice C rationale
Dimming the lights and providing a quiet atmosphere can help create a calming environment, but it is not the priority action when administering pain medication.
Choice D rationale
Assisting the patient with coping skills, including breathing techniques, is important for managing pain, but it is not the priority action when administering pain medication.
Correct Answer is B
Explanation
Choice A rationale
Monitoring the patient’s vocalizations and facial expressions can provide some information about the intensity of contractions, but it is subjective and not a reliable method for accurately assessing contraction intensity.
Choice B rationale
Palpating the maternal abdomen during a contraction is the best method for determining the intensity of contractions. By feeling the firmness of the uterus, the nurse can assess whether the contractions are mild, moderate, or strong. This method provides a more objective measure of contraction intensity compared to other methods.
Choice C rationale
Timing the amount of time between the ending of one contraction and the beginning of the next provides information about the frequency of contractions, not their intensity. This choice does not address the question of how to determine contraction intensity.
Choice D rationale
Palpating the maternal abdomen right after a contraction does not provide information about the intensity of the contraction that just occurred. The uterus will be relaxed after the contraction, making it difficult to assess the strength of the previous contraction.