A nurse is performing a nonstress test for a client who is at 38 weeks of gestation. The fetal monitor tracing reveals a series of late decelerations.
Which of the following interventions should the nurse implement first?

Choice A rationale

Administering oxygen via nasal cannula at 2 L/min might marginally increase fetal oxygenation, but it does not address the primary issue of hypotension causing decreased placental perfusion. The fundamental problem is reduced blood flow to the placenta, necessitating interventions that increase maternal circulating volume and blood pressure to improve perfusion.

Choice B rationale

Administering a lactated Ringer's 500 mL bolus directly addresses hypotension by expanding the maternal intravascular volume. This increased circulating volume raises blood pressure, thereby improving placental perfusion and oxygen delivery to the fetus. Lactated Ringer's is an isotonic solution, effective for rapid volume expansion.

Choice C rationale

Placing the client in a knee-chest position is typically used to alleviate cord compression or prolapse by shifting the fetus, not for treating hypotension. This position can actually worsen hypotension by trapping blood in the lower extremities and reducing venous return to the heart, further compromising placental blood flow.

Choice D rationale

Monitoring the client's blood pressure every 30 minutes is a crucial assessment but is not an immediate intervention for acute hypotension with decreased placental perfusion. While ongoing monitoring is essential, immediate actions are required to correct the underlying cause of hypotension and restore adequate blood flow to the placenta.

The client is at risk for developing Intraamniotic infection as evidenced by White blood cell count.

Rationale for correct answers:
Intraamniotic infection (chorioamnionitis) is a bacterial infection of the amniotic sac often associated with prolonged rupture of membranes and labor. This client has spontaneous rupture of membranes (SROM) 1 hour ago with positive nitrazine test confirming amniotic fluid presence. The elevated white blood cell count (19,800/mm³; normal 5,000–15,000/mm³) is an early marker of infection or inflammation. The presence of group B streptococcus further increases infection risk. The amniotic fluid is moderate and clear, which is normal, so fluid characteristics alone do not indicate infection. Early identification and management of intraamniotic infection are critical to prevent maternal and fetal morbidity.

Rationale for incorrect Response 1 options:
Fetal hypoxia typically manifests as abnormal fetal heart rate patterns such as late decelerations or decreased variability, which are not present here (FHR 150/min, moderate variability). Labor dystocia refers to abnormal or slow labor progress; with 2 cm dilation and regular contractions, no evidence suggests dystocia yet. Gestational hypertension is a maternal hypertensive disorder unrelated to current rupture or WBC findings.

Rationale for incorrect Response 2 options:
Amniotic fluid characteristics (clear, moderate) are normal and not indicative of infection. Uterine tone is moderate and normal on palpation, not suggesting infection or abnormal labor. Cervical exam findings (2 cm dilation, 10% effacement) are early labor signs but do not indicate infection risk.

Take home points:

• Elevated WBC after rupture of membranes signals increased risk of intraamniotic infection.
• Clear amniotic fluid with positive nitrazine confirms membrane rupture but does not confirm infection.
• Early labor signs should be monitored for infection risk, especially with group B strep positive status.
• Differentiating infection from other labor complications like dystocia or fetal hypoxia relies on clinical signs and fetal monitoring.