A 6-week-old infant with pyloric stenosis is scheduled for a pyloromyotomy. Which pre-operative nursing action has highest priority?

Choice B is correct because initiating a continuous infusion of IV fluids per prescription has highest priority for an infant with pyloric stenosis who is scheduled for a pyloromyotomy. Pyloric stenosis causes projectile vomiting and dehydration, which can lead to metabolic alkalosis and electrolyte imbalance. The infant needs IV fluids to correct these abnormalities and prevent complications.Choice A is incorrect because marking an outline of the “olive-shaped” mass in the right epigastric area is not a priority action for an infant with pyloric stenosis who is scheduled for a pyloromyotomy. The “olive-shaped” mass is a palpable sign of pyloric stenosis, but it does not require any intervention before surgery.Choice C is incorrect because monitoring amount of intake and infant's response to feedings is not a priority action for an infant with pyloric stenosis who is scheduled for a pyloromyotomy. The infant may have difficulty feeding due to vomiting and gastric distension, which can worsen their dehydration and malnutrition. The infant may need to be kept NPO (nothing by mouth) before surgery.Choice D is incorrect because instructing parents regarding care of the incisional area is not a priority action for an infant with pyloric stenosis who is scheduled for a pyloromyotomy. The incisional area will need proper care after surgery, but this can be taught later when the infant is stable and ready for discharge.