A pregnant woman presents with sudden onset of severe abdominal pain and dark red vaginal bleeding at 28 weeks gestation. On examination, the uterus is tender, and the fundus feels firm. Which of the following conditions is the most likely cause of these symptoms?

Correct Answer: D

Rationale: The most likely cause of the sudden onset of severe abdominal pain and dark red vaginal bleeding with a tender, firm uterus at 28 weeks gestation is abruptio placentae. Abruptio placentae, also known as placental abruption, is the premature separation of the placenta from the uterine wall before delivery. This condition can be life-threatening to both the mother and the fetus, as it can lead to severe bleeding and compromise the oxygen and nutrients supply to the fetus. The presentation typically includes severe abdominal pain, dark red or maroon vaginal bleeding, uterine tenderness, and a firm uterus due to the blood accumulation behind the placenta. Prompt recognition and intervention are crucial to prevent adverse maternal and fetal outcomes.

Correct Answer: B

Rationale: Meconium-stained amniotic fluid indicates that the fetus may have passed stool in utero, which can lead to potential respiratory problems once born due to meconium aspiration. The priority action for the nurse in this situation is to prepare for immediate delivery to expedite the removal of the fetus from the contaminated environment and provide necessary interventions such as suctioning of the airway to prevent aspiration of meconium. Prompt delivery is crucial to minimize the risk of complications related to meconium aspiration syndrome. Administering oxygen, inserting a urinary catheter, and notifying the neonatal resuscitation team can be important subsequent actions, but the immediate focus should be on delivering the baby.

Correct Answer: B

Rationale: Urticaria (hives) and pruritus (itching) are common signs of an allergic reaction to antibiotics, including those used for GBS prophylaxis during labor. Other signs of an adverse reaction may include flushing, fever, chills, and anaphylaxis. It is important to monitor the woman closely for any signs of an allergic reaction and to intervene promptly if one occurs to ensure the safety of both the mother and the baby.

Correct Answer: B

Rationale: In the case of umbilical cord prolapse, the priority nursing action is to prepare for an immediate cesarean section. Umbilical cord prolapse is a serious obstetric emergency where the umbilical cord slips through the cervix ahead of the presenting part of the fetus. This can lead to compression of the cord, compromising fetal blood flow and oxygenation. Immediate delivery via cesarean section is necessary in order to prevent fetal hypoxia and avoid potential complications such as brain damage or death. Elevating the mother's hips or administering intravenous fluids rapidly may be interventions done in conjunction with preparing for a cesarean section, but the priority remains expedited delivery of the baby. Applying external fetal monitoring is not the most appropriate action in this emergency situation.

Correct Answer: A

Rationale: Maternal dehydration can lead to a prolonged latent phase in labor due to inadequate hydration affecting the progress of labor. Dehydration can cause decreased blood volume, leading to poor uterine perfusion and inefficient uterine contractions. It also contributes to reduced amniotic fluid volume and can lead to maternal exhaustion. Therefore, assessment and correction of maternal hydration status are crucial in improving labor patterns and preventing complications during labor and delivery.