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: Encouraging the parent to come to the clinic if the child develops a fever is not the best response that the nurse can give. This is because a fever may indicate a serious infection, such as Lyme disease, that requires prompt treatment. The nurse should not wait for the child to develop a fever before advising the parent to seek medical attention.

Choice B reason: Instructing the parent to apply an antihistamine ointment for one week is not the best response that the nurse can give. This is because an antihistamine ointment may not be effective for a fungal infection, such as ringworm, or a bacterial infection, such as Lyme disease, that may cause a circular rash. The nurse should not recommend any OTC product without knowing the exact cause of the rash.

Choice C reason: Offering reassurance that OTC corticosteroid creams are safe and effective is not the best response that the nurse can give. This is because corticosteroid creams may worsen a fungal infection, such as ringworm, or mask the symptoms of a bacterial infection, such as Lyme disease, that may cause a circular rash. The nurse should not recommend any OTC product without knowing the exact cause of the rash.

Choice D reason: Explaining the need for the child to have an immediate medical evaluation is the best response that the nurse can give. This is because a circular rash can be a sign of a serious condition, such as Lyme disease, that requires urgent diagnosis and treatment. The nurse should inform the parent that the rash may not be ringworm, as many people assume, and that it may be caused by a tick bite or another factor. The nurse should also advise the parent to avoid touching or scratching the rash and to keep it clean and dry until the child sees a doctor.

Choice A reason: Showing indifference to verbal stimulation is not a specific sign of ASD. Some children may have hearing problems, language delays, or other developmental issues that affect their response to verbal cues. However, the nurse should still assess the child's hearing and language skills and refer them to a specialist if needed.

Choice B reason: Having a history of temper tantrums is not a specific sign of ASD. Many children have tantrums as a normal part of their emotional development, especially when they are frustrated, tired, or hungry. However, the nurse should still evaluate the frequency, intensity, and duration of the tantrums and provide guidance to the parents on how to manage them.

Choice C reason: Stroking the hair of a handheld doll is not a specific sign of ASD. This behavior may indicate that the child has a preference for tactile stimulation, which is common among children. It may also show that the child has an attachment to the doll, which is a positive sign of social development.

Choice D reason: Performing odd repetitive behaviors is a specific sign of ASD. These behaviors may include rocking, spinning, hand flapping, lining up objects, or repeating words or sounds. These behaviors are often used by children with ASD to cope with sensory overload, anxiety, or boredom. They may also interfere with the child's learning and social interaction. The nurse should request a follow-up for a possible ASD diagnosis and provide support to the child and the parents.