A 2-year-old toddler with Kawasaki disease is admitted to the pediatric unit. The child has been febrile for 6 days and exhibits bilateral conjunctival injection, strawberry tongue, and polymorphous rash. Which nursing action should be the highest priority?

In the acute phase of Kawasaki disease, the highest priority nursing action is continuous cardiac monitoring. The systemic vasculitis targets the coronary arteries, and the development of aneurysms is the most significant determinant of long-term morbidity and mortality.

• Place the child on a cardiac monitor and assess rhythm for signs of myocarditis, ischemia, or arrhythmias.
• Obtain a baseline echocardiogram and serial follow-ups as ordered to evaluate for coronary artery dilatation or aneurysms.
• Closely monitor vital signs, noting any signs of heart failure such as tachycardia, gallop rhythm, or respiratory distress.

While administering aspirin, providing comfort measures, and maintaining hydration are all important components of care, they are secondary to the early detection of life-threatening cardiac complications. A child can decompensate rapidly from myocardial ischemia or arrhythmia, making vigilant monitoring the immediate priority.