Complications

Kawasaki disease is a leading cause of acquired heart disease in children. However, with effective treatment, only a few children have lasting damage.

Heart complications include:

• Inflammation of blood vessels, usually the coronary arteries, that supply blood to the heart
• Inflammation of the heart muscle
• Heart valve problems

Any of these complications can damage your child's heart. Inflammation of the coronary arteries can lead to weakening and bulging of the artery wall (aneurysm). Aneurysms increase the risk of blood clots, which could lead to a heart attack or cause life-threatening internal bleeding.

For a very small percentage of children who develop coronary artery problems, Kawasaki disease can cause death, even with treatment.