The heart and conduction system in acute Kawasaki disease: report of fraternal cases--one lethal, one relapsing

Area of Science:

• Pediatric Cardiology
• Rheumatology
• Pathology

Background:

• Kawasaki disease (KD) is an acute febrile illness primarily affecting young children.
• Cardiac complications, including coronary artery abnormalities, are a major concern in KD.
• Sudden death in the early phase of KD, particularly with conduction system involvement, is rare but critical.

Purpose of the Study:

• To examine the cardiac and conduction system pathology in a child with Kawasaki disease who died suddenly.
• To investigate the extent of inflammation and its impact on the specialized conduction system.
• To understand potential familial predisposition to Kawasaki disease.

Main Methods:

• Autopsy and histopathological examination of the heart and conduction system.
• Detailed analysis of inflammatory infiltrates and vascular changes.
• Review of clinical history, including family history.

Main Results:

• Severe perivasculitis, neuritis, and pancarditis were observed.
• All components of the specialized cardiac conduction system showed significant involvement.
• The patient's sibling experienced relapsing Kawasaki disease, treated successfully with intravenous gamma globulin.

Conclusions:

• Kawasaki disease can cause severe, widespread inflammation affecting the entire cardiac conduction system, potentially leading to sudden death.
• Early diagnosis and prompt treatment are crucial for managing Kawasaki disease and preventing severe cardiac sequelae.
• Familial occurrence of Kawasaki disease warrants further investigation into genetic or environmental factors.