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: 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.

Choice A reason: Flaring of the nares is a sign of acute respiratory distress in children. It indicates that the child is using the accessory muscles of the nose to breathe, which is a sign of increased work of breathing. Flaring of the nares may be accompanied by other signs of respiratory distress, such as retractions, grunting, or cyanosis. The nurse should report this finding to the health care provider and monitor the child's oxygen saturation, respiratory rate, and level of consciousness.

Choice B reason: Diaphragmatic respirations are not a specific sign of acute respiratory distress in children. They are a normal pattern of breathing in infants and young children, who use their diaphragm more than their chest muscles to breathe. Diaphragmatic respirations may become more pronounced when the child is crying, feeding, or sleeping, but they are not indicative of respiratory distress.

Choice C reason: A resting respiratory rate of 35 breaths/min is not a sign of acute respiratory distress in children. It is within the normal range for a 1-year-old child, who typically has a respiratory rate of 20 to 40 breaths/min. A resting respiratory rate of more than 60 breaths/min may be a sign of respiratory distress in children, especially if it is associated with other symptoms, such as wheezing, coughing, or nasal flaring.

Choice D reason: Bilateral bronchial breath sounds are not a sign of acute respiratory distress in children. They are normal breath sounds that are heard over the trachea and the large bronchi. They are loud and high-pitched, and have a longer expiratory phase than inspiratory phase. Bilateral bronchial breath sounds do not indicate any lung pathology or obstruction.