A nurse is caring for a child who has Kawasaki disease. Which of the following systems should the nurse monitor in response to this diagnosis?

A. Respiratory symptoms are not a primary concern in Kawasaki disease. Although fever may lead to general discomfort, respiratory complications are not characteristic of the condition. B. While Kawasaki disease does present with skin changes (such as rash, peeling of the skin on the hands and feet), these are secondary findings and not the most critical system to monitor. C. Gastrointestinal symptoms like abdominal pain may occur, but they are not the major clinical concern or focus for monitoring. D. Kawasaki disease is a form of vasculitis that primarily affects the cardiovascular system. It can lead to coronary artery aneurysms, myocarditis, and arrhythmias. Continuous monitoring of cardiac function, including echocardiograms and ECGs, is essential for early detection and intervention of life-threatening complications.