1. Coronary artery aneurysm
Vasculitis may weaken one of the arteries of the heart. As the blood passes through the weakened artery, it may bulge (balloon). This is called aneurysm.
Aneurysm can reduce the blood supply in one part of the heart, causing an infarction (heart attack) or interrupted the blood flow, resulting in heart disease.
Although rare, the weakened and ballooned artery can also rupture, causing bleeding.
2. Inflammation of the heart muscle
One of the potential Kawasaki disease complications is the inflammation of the heart muscle (myocarditis). It can also result in the inflammation of the lining of the heart (endocarditis) or the covering (pericarditis).
3. Heart valve problems
Valves ensure that proper blood flow in the heart. If one of the valves does not work properly, the blood may flow backward. This causes the heart to work harder.
4. Heart failure
Another of the Kawasaki disease complications is heart failure. This occurs when the heart no longer pumps blood as efficiently as before.
5. Kawasaki disease shock syndrome
Finally, KD may result in a shock syndrome characterized by a “sustained decrease of the systolic blood pressure,” which is the top number. The decrease can be greater than 20% of the baseline. KDSS may also result in poor perfusion, which means the extremities do not receive adequate blood flow.
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