Kawasaki Disease: The Fever That Can Damage Your Child's Heart — What Parents Must Know

Kawasaki disease (KD) is an acute self-limiting vasculitis — inflammation of blood vessels — occurring almost exclusively in children under 5 years. It is the most common cause of acquired coronary artery disease in childhood in countries where it is recognised and treated. In India, KD is underdiagnosed — many cases are labelled "viral fever" or "drug reaction" and go untreated, risking coronary artery aneurysms that can cause heart attack even in a 3-year-old.

The Diagnostic Criteria

KD is diagnosed clinically — by the pattern of features. Classic KD requires fever lasting 5 or more days PLUS at least 4 of the following 5 features:

1. Conjunctival injection: Both eyes red without discharge (bilateral non-exudative conjunctivitis)
2. Oral changes: Strawberry tongue (red, enlarged papillae), cracked red lips, diffuse redness of the oral mucosa
3. Rash: Polymorphous rash (variable — macular, maculopapular, or targetoid) on the trunk. Notably, it is NOT vesicular
4. Extremity changes: Redness and swelling of the palms and soles (acute phase), followed by characteristic peeling of the skin around the fingers and toes in convalescence (desquamation)
5. Lymphadenopathy: Usually single enlarged cervical lymph node, more than 1.5cm

Importantly: a child with 5 days of fever and only 3 of these features should still be evaluated for "incomplete KD" — because the coronary risk exists even without full criteria.

Why KD Damages the Heart

The vasculitis in KD preferentially affects the coronary arteries. Untreated, 25% of children develop coronary artery aneurysms — areas of vessel wall weakening that can thrombose, causing myocardial infarction. Aneurysms >8mm carry high risk of rupture or thrombosis.

Treatment — Why Speed Matters

IVIG (intravenous immunoglobulin) + aspirin given within 10 days of fever onset reduces coronary aneurysm risk from 25% to less than 5%. This is a dramatic, time-dependent benefit. After day 10, treatment still reduces inflammation but the benefit for aneurysm prevention is reduced. Every day matters.

For prolonged fever evaluation in children: Dr. Sushma B at Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.