The nurse is caring for a 5-day-old newborn with patent ductus arteriosus with the following vital signs: pulse 160 beats per minute, respirations 80 breaths per minute, oxygen saturation 92 Which order should the nurse querry

Choice A rationale Administering furosemide, a loop diuretic, is often utilized in the management of patent ductus arteriosus (PDA) to decrease pulmonary congestion. This medication works by inhibiting sodium and chloride reabsorption in the ascending limb of the loop of Henle, which promotes diuresis and reduces the fluid volume overload contributing to respiratory distress, but it is not the primary mechanism to close the defect. The newborn's vital signs, especially the tachypnea and mild desaturation, suggest significant pulmonary overflow that needs corrective intervention. Choice B rationale Indomethacin, a nonsteroidal anti-inflammatory drug (NSAID), is a prostaglandin synthesis inhibitor which is the primary pharmacological treatment for closing a hemodynamically significant PDA in a premature infant. Prostaglandins, particularly PGE_2, maintain ductal patency, so blocking their production allows the ductus arteriosus to constrict and eventually close. The elevated pulse and respiratory rate in this newborn indicate a large left-to-right shunt requiring this specific closure therapy. Choice C rationale Initiating intravenous access is a necessary procedural step for administering medications like indomethacin or furosemide, but it is not the therapeutic "order" that directly addresses the pathophysiology of the PDA. Securing IV access is a prerequisite action for treatment, but Choice B represents the most critical therapeutic order to question for a patient presenting with symptomatic PDA and signs of pulmonary overcirculation. Choice D rationale While newborns with PDA often have increased caloric needs due to the work of breathing and potential heart failure, feeding a high-calorie formula every two hours is a supportive measure, not the urgent primary treatment. Furthermore, frequent, large feeds may exacerbate respiratory distress or necrotizing enterocolitis due to gut hypoperfusion in a severely compromised infant. The priority is to close the PDA and stabilize the cardiorespiratory status.