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?

Choice A rationale:

The umbilical cord typically contains two arteries and one vein. Arteries carry oxygen-depleted blood and waste products from the fetus to the placenta for removal, while the vein carries oxygenated blood and nutrients from the placenta to the fetus. This arrangement is essential for maintaining proper fetal circulation during pregnancy.

Choice B rationale:

This choice is incorrect because the umbilical cord usually contains two arteries and one vein, not just one artery and one vein. Having only one artery could indicate a potential vascular abnormality or congenital issue that may require further investigation or medical attention.

Choice C rationale:

This is the correct answer. The umbilical cord usually contains two arteries and one vein. The presence of two arteries allows for the efficient removal of waste products and carbon dioxide from the fetus, while the single vein delivers essential nutrients and oxygen to support the baby's growth and development.

Choice D rationale:

This choice is incorrect as it states two veins and one artery, which is not the typical configuration of blood vessels in the umbilical cord. Having two veins and one artery would disrupt fetal circulation and hinder proper nutrient and waste exchange between the fetus and the placenta.

Choice A rationale :

Prepare for cesarean birth. The nurse should consider preparing for a cesarean birth as the client is at 39 weeks of gestation and has heavy vaginal bleeding. Heavy vaginal bleeding during pregnancy could indicate an emergency situation such as placental abruption or placenta previa, both of which can be life-threatening for the mother and the baby. In such cases, an emergency cesarean birth might be necessary to ensure the safety of both the client and the baby. Promptly preparing for the procedure will help expedite the process and prevent any delays in providing necessary medical care.

Choice B rationale

Initiate an IV infusion of magnesium sulfate. Magnesium sulfate is not indicated in this situation. Magnesium sulfate is commonly used in obstetrics, particularly in the management of preeclampsia and eclampsia to prevent seizures. However, the client's heavy vaginal bleeding suggests a different issue and magnesium sulfate would not address the underlying cause. Instead, the focus should be on identifying and managing the cause of the bleeding to ensure the best outcome for the client and the baby.

Choice C rationale

Administer antibiotics. Administering antibiotics is not the priority action in this scenario. Heavy vaginal bleeding in a pregnant client requires immediate attention to assess the cause and determine the appropriate course of action. While antibiotics may be necessary in some situations, they are not the first-line treatment for heavy vaginal bleeding during pregnancy. The nurse should focus on providing prompt and appropriate care to address the client's immediate needs.

Choice D rationale

Request the RN to perform a cervical examination. Performing a cervical examination may provide valuable information about the cause of the heavy vaginal bleeding. It can help determine if the bleeding is related to cervical changes, such as cervical dilation or effacement. The findings from the cervical examination, along with other assessments, will aid in making the most appropriate decisions regarding the client's care. However, it is not the only action that the nurse should take. In this critical situation, the nurse must prioritize immediate interventions to ensure the safety and well-being of the client and the baby.