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

Bladder distention upon palpation indicates urinary retention, not effective voiding. When the bladder remains distended, it signifies incomplete emptying, which can lead to urinary stasis and increased risk of urinary tract infections. Effective voiding requires coordinated detrusor muscle contraction and urethral sphincter relaxation, which is absent with distention.

Choice B rationale

A uterine fundus 2 cm above the umbilicus, especially in the postpartum period, suggests uterine atony and possible bladder distention. A full bladder can displace the uterus upward and to the side, preventing effective uterine contraction and involution, which is crucial for preventing postpartum hemorrhage. Normal fundal height should decrease daily.

Choice C rationale

Not feeling the urge to urinate could indicate nerve damage, overdistention with sensory nerve suppression, or a very low urine output. Normal bladder sensation is crucial for effective voiding. The absence of the urge may lead to prolonged bladder distention, increasing the risk of infection and bladder dysfunction, which hinders efficient emptying.

Choice D rationale

Urinating 30 mL/hr, while seemingly low, is a continuous output and suggests the client is able to empty their bladder, albeit slowly. Postpartum diuresis typically begins within 12 hours, with urine output of 100 to 250 mL/hr common. However, any consistent output, rather than retention, indicates some voiding effectiveness.

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.