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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Breech presentation means the fetus’s buttocks or feet are positioned to be delivered first. Fetal heart tones are often heard above the umbilicus in this position.
Choice B rationale
Transverse lie means the fetus is lying horizontally in the uterus. Fetal heart tones would typically be heard at the sides of the abdomen.
Choice C rationale
Cephalic presentation means the fetus’s head is positioned to be delivered first. Fetal heart tones are usually heard below the umbilicus in this position.
Choice D rationale
Oblique lie means the fetus is positioned diagonally in the uterus. Fetal heart tones can be variable depending on the exact position.
Correct Answer is B
Explanation
Choice B rationale
Doppler flow studies are non-invasive tests that assess blood flow in the umbilical artery and other fetal vessels. These studies are particularly useful in evaluating placental perfusion and identifying intrauterine growth restriction (IUGR). Abnormal Doppler flow patterns can indicate compromised blood flow to the fetus, which is a concern in cases of minimal fetal growth.
Choice A rationale
Magnetic Resonance Imaging (MRI) is a non-invasive imaging technique that provides detailed images of the fetus and placenta. However, it is not typically used as the first-line test for assessing placental perfusion and IUGR. Doppler flow studies are more specific for evaluating blood flow and detecting issues related to placental insufficiency.
Choice C rationale
Amniocentesis is an invasive procedure that involves extracting a sample of amniotic fluid for genetic testing and assessment of fetal lung maturity. It is not used for evaluating placental perfusion or IUGR7.
Choice D rationale
Chorionic villus sampling (CVS) is an invasive procedure used for early genetic testing by sampling placental tissue. It is not used for assessing placental perfusion or IUGR7.
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