The nurse is conducting an admission assessment of an infant with heart failure who is scheduled for repair of restenosis of coarctation of the aorta that was repaired 4 days after birth. Findings include blood pressure higher in the arms than the lower extremities, pounding brachial pulses, and slightly palpable femoral pulses. Which pathophysiologic mechanism supports these findings?

Choice A reason: Giving prescribed intravenous antibiotics is not the first action that the nurse should take. Antibiotics are used to treat the infection and inflammation caused by appendicitis, but they are not enough to prevent the complications of a ruptured appendix. The nurse should administer the antibiotics as ordered, but only after notifying the healthcare provider of the change in the child's condition.

Choice B reason: Inquiring about the client's last meal is not the first action that the nurse should take. The last meal may be relevant for the preparation of the surgery, but it is not urgent or related to the sudden relief of pain. The nurse should ask about the last meal as part of the preoperative assessment, but only after contacting the healthcare provider.

Choice C reason: Contacting the healthcare provider is the first action that the nurse should take. Sudden relief of pain in a child with appendicitis may indicate a perforation or rupture of the appendix, which is a life-threatening emergency. The nurse should immediately report this finding to the healthcare provider, who may order additional tests or expedite the surgery.

Choice D reason: Documenting the client's relief of pain is not the first action that the nurse should take. Documentation is an important part of nursing care, but it is not a priority in this situation. The nurse should document the child's pain level, vital signs, and interventions, but only after contacting the healthcare provider and taking appropriate actions.

Choice A reason: Changing position every 2 hours is not the most important intervention that the nurse should implement. This is because the child's position is limited by the traction and the splint, and frequent repositioning may interfere with the alignment and stability of the fracture. The nurse should only change the position of the child as ordered by the physician and with the assistance of another nurse.

Choice B reason: Assessing skin for redness and signs of tissue breakdown is not the most important intervention that the nurse should implement. This is because the skin is not directly in contact with the traction or the splint, and the risk of pressure ulcers is low. The nurse should still inspect the skin regularly and provide skin care as needed, but this is not the priority.

Choice C reason: Cleansing pin sites as prescribed is not the most important intervention that the nurse should implement. This is because the pin sites are not the main source of infection or complication in this type of traction. The nurse should still follow the protocol for pin site care and monitor for signs of infection, such as redness, swelling, drainage, or odor, but this is not the priority.

Choice D reason: Monitoring peripheral pulses and sensation in the right leg is the most important intervention that the nurse should implement. This is because the traction and the splint can impair the circulation and nerve function of the affected extremity, leading to complications such as compartment syndrome, ischemia, or nerve damage. The nurse should check the pulses, temperature, color, capillary refill, and sensation of the right leg at least every hour and report any changes or abnormalities to the physician.