A Patient with Kawasaki Disease Showing Severe Tricuspid Regurgitation and Left Ventricular Dysfunction in the Acute Phase

We encountered a male aged 6 years 4 months with Kawasaki disease (KD) with severe tricuspid regurgitation and left ventricular dysfunction in the acute phase. His clinical course and findings of endomyocardial biopsy suggested that myocarditis was the cause of left ventricular dysfunction and responsible for the development of tricuspid regurgitation. With improvement of left ventricular function, the tricuspid regurgitation rapidly improved, then disappeared. There are no previous reports in the literature of KD complicated by severe tricuspid regurgitation.