A nurse is performing a nonstress test on a client who is at 35 weeks of gestation and has diabetes mellitus. The test reveals no accelerations of fetal heart rate for 20 min. Which of the following actions should the nurse take?

The correct answer is choice A, administer broad-spectrum antibiotics.

Choice A rationale:

Administering broad-spectrum antibiotics is crucial for a newborn with a myelomeningocele that is leaking cerebrospinal fluid to prevent infection. The leaking of cerebrospinal fluid can increase the risk of meningitis, which is an infection of the membranes covering the brain and spinal cord. Broad-spectrum antibiotics are used as a prophylactic measure to reduce this risk.

Choice B rationale:

Monitoring the rectal temperature every 4 hours is important for detecting fever, which could indicate infection. However, it is not the most immediate action required for a newborn with a leaking myelomeningocele. The priority is to prevent infection through the administration of antibiotics.

Choice C rationale:

Cleansing the site with povidone-iodine is not recommended for a myelomeningocele because it can be toxic to the exposed neural tissue. Instead, the area should be covered with a sterile saline dressing to protect the site and prevent drying and further damage to the neural tissue.

Choice D rationale:

While surgical closure is necessary for a newborn with myelomeningocele, it is typically performed within 24 to 48 hours after birth, not after 72 hours. Early closure is essential to reduce the risk of infection and further damage to the exposed spinal cord and nerves.

The correct answer is Choice C.

Choice A rationale: Thiazide diuretics cause potassium and chloride loss, leading to metabolic alkalosis, not respiratory alkalosis. Hypokalemia decreases hydrogen ion excretion, increasing bicarbonate levels. Metabolic alkalosis is characterized by pH >7.45 and HCO₃⁻ >26 mEq/L rather than decreased PaCO₂.

Choice B rationale: Vomiting leads to metabolic alkalosis due to gastric acid loss. Hydrogen ion depletion increases bicarbonate concentration, shifting pH above normal. Arterial blood gases typically show increased HCO₃⁻ (>26 mEq/L) with a compensatory increase in PaCO₂ (>45 mmHg), not respiratory alkalosis.

Choice C rationale: Salicylate intoxication initially induces hyperventilation, reducing PaCO₂ levels below 35 mmHg and increasing pH above 7.45, leading to respiratory alkalosis. As toxicity progresses, metabolic acidosis may develop due to lactic acid accumulation, but early stages primarily present with respiratory alkalosis.

Choice D rationale: Hypoventilation leads to CO₂ retention, increasing PaCO₂ above 45 mmHg, forming carbonic acid (H₂CO₃) and causing respiratory acidosis. Blood gases show pH <7.35 with elevated PaCO₂, not respiratory alkalosis, which is caused by excessive CO₂ elimination through hyperventilation.