A nurse is performing a nonstress test (NST) on a client who is at 36 weeks of gestation and asks "what are you looking for during this test?" Which of the following responses should the nurse make?
"We are looking for increases in fetal heart rate of 15 beats per minute for at least 15 seconds.
"We will draw blood to evaluate the baby's risk of genetic problems.”.
"If the baby moves 5 times in 15 minutes, then the baby is healthy.”.
"I am looking at the ultrasound to see if the baby has any congenital anomalies.”.
The Correct Answer is A
Choice A rationale
A reactive nonstress test demonstrates at least two accelerations in fetal heart rate, defined as an increase of 15 beats per minute above the baseline lasting for 15 seconds, within a 20-minute period. These accelerations indicate adequate fetal oxygenation and a healthy fetal autonomic nervous system response to movement.
Choice B rationale
Drawing blood to evaluate the baby's risk of genetic problems is typically performed through procedures like amniocentesis or chorionic villus sampling, not during a nonstress test. A nonstress test assesses fetal well-being based on heart rate patterns in response to fetal movement.
Choice C rationale
While fetal movement is an indicator of fetal well-being, the nonstress test specifically evaluates the fetal heart rate response to that movement. The number of movements within a specific time frame is a component of a biophysical profile, not the sole indicator in a nonstress test.
Choice D rationale
Ultrasound is used to visualize fetal anatomy and assess for congenital anomalies, which is a component of a fetal anatomy scan typically performed around 18-20 weeks of gestation. A nonstress test primarily monitors fetal heart rate and its reactivity.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Methergine (methylergonovine) is an oxytocic medication that causes vasoconstriction and increases blood pressure. It is contraindicated in clients with hypertension. Therefore, assessing the client's blood pressure before administration is crucial to ensure safety. Normal adult blood pressure is typically less than 120/80 mmHg.
Choice B rationale
Assessing uterine tone is important in managing postpartum hemorrhage, as a boggy uterus contributes to bleeding. However, before administering a medication that affects blood pressure, the blood pressure itself is the priority assessment due to the contraindications of Methergine in hypertensive clients.
Choice C rationale
Deep tendon reflexes are assessed in the postpartum period, particularly for clients with preeclampsia who are at risk for magnesium sulfate toxicity. While important, it is not the priority assessment before administering Methergine, which has a direct impact on blood pressure.
Choice D rationale
Assessing the amount of lochia is essential for monitoring postpartum bleeding. However, before administering Methergine, which can significantly increase blood pressure, ensuring the client does not have a contraindication related to hypertension is the most critical immediate assessment. .
Correct Answer is []
Explanation
Rationale for Correct Condition
Preterm labor is defined as the onset of regular contractions leading to cervical change before 37 weeks of gestation. This client’s symptoms, including uterine contractions every 4–5 minutes, cervical effacement of 50%, a positive fetal fibronectin test, and shortened cervical length, strongly indicate preterm labor rather than pyelonephritis, placental abruption, or cervical insufficiency.
Rationale for Correct Actions
Magnesium sulfate functions as a tocolytic, suppressing contractions by inhibiting calcium influx in myometrial cells, thereby delaying preterm birth and reducing neonatal complications. Betamethasone accelerates fetal lung maturity by increasing surfactant production, reducing the risk of neonatal respiratory distress syndrome if preterm delivery occurs.
Rationale for Correct Parameters
Cervical effacement is a direct indicator of labor progression, showing changes in cervical thinning that accompany dilation. Monitoring effacement allows assessment of tocolytic effectiveness. Contraction frequency reveals labor severity and the response to magnesium sulfate. Persistent contractions despite treatment indicate the need for additional interventions.
Rationale for Incorrect Conditions
Pyelonephritis causes systemic symptoms like fever, flank pain, and bacteremia rather than uterine contractions and cervical changes. Placental abruption typically presents with painful vaginal bleeding and uterine tenderness, which are absent here. Cervical insufficiency is painless and lacks regular contractions, with cervical changes occurring silently rather than progressively.
Rationale for Incorrect Actions
Urine culture identifies infection but does not directly treat preterm labor. RhoGAM is necessary for Rh-negative individuals, which is irrelevant in this case. IV hydration may help with contractions but is not a primary intervention.
Rationale for Incorrect Parameters
Flank pain suggests pyelonephritis rather than preterm labor. Vaginal bleeding is associated with abruption or miscarriage, not preterm labor without cervical rupture. Fetal heart rate variability is useful in fetal assessment but does not directly indicate labor progression.
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