A nurse is assisting with the monitoring of a client who is in the first stage of labor, with an external fetal monitor in place and IV fluids infusing. Which of the following factors will cause variable decelerations in the fetal heart rate?
Fetal head compression.
Umbilical cord compression.
Maternal opioid administration.
Uteroplacental insufficiency.
The Correct Answer is B
Choice A rationale:
Fetal head compression is unlikely to cause variable decelerations in the fetal heart rate. During contractions and labor, the fetal head may experience pressure, but this usually leads to early decelerations, not variable decelerations. Early decelerations are considered benign and are caused by the head's pressure stimulating the vagus nerve, resulting in a temporary decrease in heart rate.
Choice B rationale:
Umbilical cord compression is a known cause of variable decelerations in the fetal heart rate. When the umbilical cord is compressed, it can temporarily disrupt blood flow and oxygen supply to the fetus, leading to decelerations. Variable decelerations often appear as abrupt, sharp drops in the fetal heart rate and are typically characterized by their unpredictable
nature.
Choice C rationale:
Maternal opioid administration is not a direct cause of variable decelerations in the fetal heart rate. While opioids can cross the placenta and may affect the fetus, they are more likely to cause other issues, such as respiratory depression in the newborn, rather than variable decelerations.
Choice D rationale:
Uteroplacental insufficiency is not the primary factor causing variable decelerations. Uteroplacental insufficiency refers to an inadequate blood flow and oxygen delivery to the placenta, which can lead to late decelerations in the fetal heart rate, not variable decelerations.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Rh incompatibility is not relevant in this scenario. Rh incompatibility refers to a condition where the mother's blood is Rh-negative, and the baby's blood is Rh-positive, which can lead to hemolytic disease of the newborn. However, this condition is unrelated to the client's current presentation of heavy, red vaginal bleeding without contractions.
Choice B rationale:
Frequency and duration of contractions are not the primary concern in this situation. The client's main complaint is heavy vaginal bleeding without contractions, which indicates a potential issue with the placenta or other pregnancy-related problems.
Choice C rationale:
Fetal lung maturity is not the priority at this stage. The client is at 38 weeks of gestation, which is considered full term. Fetal lung maturity is typically assessed if there's a need for early delivery, which is not indicated in this scenario.
Choice D rationale:
The correct choice. The client is experiencing heavy, red vaginal bleeding, which may be a sign of placental abruption, where the placenta separates from the uterine wall prematurely. Determining the location of the placenta through an ultrasound can help identify if placental abruption is the cause of bleeding. Placental abruption can be a serious condition that requires immediate medical attention.
Correct Answer is B
Explanation
Choice A rationale:
0.25 mL - The nurse should not administer 0.25 mL because the available concentration of vitamin K injection is 1 mg/0.5 mL. To achieve the prescribed dose of 1 mg, administering only 0.25 mL would be insufficient.
Choice B rationale:
0.5 mL - This is the correct choice. The nurse should administer 0.5 mL of the vitamin K injection to deliver 1 mg of vitamin K, as the concentration of the injection is 1 mg/0.5 mL. By giving the full 0.5 mL, the newborn will receive the appropriate 1 mg dose.
Choice C rationale:
0.75 mL - Administering 0.75 mL would be excessive for the prescribed 1 mg dose of vitamin K. It is unnecessary to give a higher volume than required, as it could lead to potential adverse effects or wastage.
Choice D rationale:
1 mL - Similarly, administering the entire 1 mL of the vitamin K injection would result in doubling the prescribed dose, leading to potential overdose and adverse reactions. The nurse should avoid administering more than the necessary 0.5 mL.
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