A nurse is providing care for a client who is in labor.
The nurse notes variable decelerations on the fetal heart rate monitor.
What could be the cause?
Umbilical cord compression.
Maternal hypotension.
Fetal sleep cycle.
Use of epidural anesthesia.
The Correct Answer is A
Choice A rationale:
Umbilical cord compression is the most common cause of variable decelerations. It occurs when the umbilical cord is
compressed, momentarily reducing blood flow to the fetus and causing a decrease in fetal heart rate.
Variable decelerations are characterized by their abrupt onset, variable duration, and unpredictable shape. They typically
recover quickly to the baseline fetal heart rate after the compression is relieved.
Several factors can contribute to umbilical cord compression, including:
Fetal movement: The fetus can sometimes move in a way that compresses the cord, especially during active labor.
Oligohydramnios (low amniotic fluid): With less amniotic fluid, there's less cushioning around the cord, making it more prone
to compression.
Nuchal cord (cord around the neck): If the cord is wrapped around the fetus's neck, it can become compressed during
contractions.
Short umbilical cord: A shorter cord has less slack, increasing the risk of compression.
Choice B rationale:
Maternal hypotension can cause fetal heart rate decelerations, but these typically present as late decelerations, not variable
decelerations. Late decelerations have a gradual onset, a uniform shape, and typically occur after the peak of a contraction.
Maternal hypotension can decrease placental blood flow, leading to fetal hypoxia (decreased oxygen supply). This hypoxia can
then trigger a decrease in fetal heart rate.
Choice C rationale:
The fetal sleep cycle does not typically cause variable decelerations in the fetal heart rate. During sleep, the fetal heart rate
may exhibit a decrease in baseline variability, but this is not the same as variable decelerations.
Choice D rationale:
The use of epidural anesthesia can sometimes cause a decrease in fetal heart rate variability, but it does not typically cause
variable decelerations. Epidural anesthesia can lead to maternal hypotension, which, as mentioned earlier, can cause late
decelerations.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
Checking the client’s blood pressure is important, but it is not the first action the nurse should take. Hypotension could
indicate hemorrhage, but the nurse needs to address the immediate risk of excessive bleeding.
Choice B rationale:
The nurse should first massage the client’s fundus. A saturated perineal pad could indicate a postpartum hemorrhage.
Massaging the fundus helps the uterus contract and may stop the bleeding.
Choice C rationale:
Observing for pooling of blood under the buttocks is a way to assess for bleeding. However, this is not the first action because
it does not address the cause of the bleeding.
Choice D rationale:
Administering oxytocin can help the uterus contract and reduce bleeding. However, this is not the first action because it
requires a physician’s order.
Correct Answer is B
Explanation
Choice A rationale:
There is no evidence to suggest that epidural anesthesia delays the rupture of fetal membranes. The timing of rupture of fetal
membranes is influenced by various factors, including the strength of uterine contractions, the position of the baby, and the
elasticity of the amniotic sac. Epidural anesthesia does not directly affect these factors.
Choice B rationale:
Epidural anesthesia can prolong labor by interfering with the natural process of labor. It can weaken uterine contractions,
slow down cervical dilation, and potentially lead to a prolonged second stage of labor. This is because the anesthesia blocks the
nerve signals that control the muscles of the uterus. When these signals are blocked, the contractions may become less
frequent and less intense. This can delay the progress of labor and increase the risk of interventions such as forceps delivery
or cesarean section.
Choice C rationale:
While epidural anesthesia can have some effects on the baby, it is not a primary cause of fetal depression. Fetal depression is
typically caused by other factors, such as decreased oxygen supply to the baby, maternal infection, or placental problems.
Epidural anesthesia can sometimes lead to a temporary decrease in the baby's heart rate, but this is usually well-managed by
the healthcare team and does not typically lead to significant fetal depression.
Choice D rationale:
Epidural anesthesia does not typically cause maternal hypertension. In fact, it can sometimes have the opposite effect and
cause a slight decrease in blood pressure. This is because the anesthesia can relax the blood vessels, which can lead to a drop
in blood pressure. However, this is usually not a significant concern and is easily managed by the healthcare team.
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