Correct Answer: B

Rationale: Measles is an airborne infection, so placing the child in airborne isolation is crucial to prevent the spread of the virus to others. Airborne isolation precautions help contain infectious respiratory droplets and reduce the risk of transmission to healthcare workers, other patients, and visitors.

Correct Answer: A

Rationale: The correct answer is A. Duchenne muscular dystrophy is an X-linked recessive disorder that primarily affects males. It is crucial for the nurse to explain to the parents that this condition follows an inheritance pattern where the gene mutation responsible for the disorder is located on the X chromosome. Males have only one X chromosome, so if they inherit the mutated gene, they will develop the disease. Females, on the other hand, have two X chromosomes, providing a backup copy that can compensate for the mutation. Understanding this inheritance pattern is essential for family planning decisions, as the risk of passing on the disorder to future children can be explained based on this genetic inheritance.

Correct Answer: A

Rationale: Creating a quiet environment is the priority intervention as it helps reduce irritability and stress in children with Kawasaki disease. This intervention can promote a soothing atmosphere for the child, which may help in managing their symptoms effectively. Once the child is in a peaceful setting, further interventions such as addressing nutritional needs or skincare can be addressed.

Correct Answer: B

Rationale: In pediatric patients, digoxin administration is guided by the heart rate. If the child's heart rate is below the established threshold, which is typically 90-100 beats per minute in a 4-year-old, the medication should be withheld, and the healthcare provider should be notified for further evaluation and instructions.

Correct Answer: D

Rationale: A significant drop in heart rate and blood pressure should be reported immediately as it may indicate worsening of the congenital heart defect. The blood pressure of 70/40 is dangerously low and requires immediate attention to prevent further complications.