Final answer:
The most serious complication in Kawasaki disease is coronary aneurysm.
Step-by-step explanation:
The most serious complication for which the nurse should assess in Kawasaki disease is coronary aneurysm.
Kawasaki disease is an acute febrile illness that primarily affects children. It involves inflammation of blood vessels throughout the body, including the coronary arteries. The most significant and potentially life-threatening complication of Kawasaki disease is the development of coronary artery aneurysms.
A coronary aneurysm is a localized dilation or bulging of the blood vessel wall in the coronary arteries. If left untreated, it can lead to the formation of blood clots, narrowing of the blood vessels, and potentially result in a heart attack.