Kawasaki disease is the leading cause of acquired heart disease in children in developed countries — and it is underdiagnosed in India. Dr. Sushma B explains the five diagnostic features and why treatment within 10 days is critical.
Key Points
- Kawasaki disease is a vasculitis of medium-sized vessels in children under 5 — the most common cause of acquired heart disease in children in developed countries.
- Classic features: fever ≥5 days + 4 of 5 criteria (rash, red eyes, red lips/tongue, red palms/soles, swollen lymph node).
- Coronary artery aneurysms develop in 25% of untreated cases — potentially fatal.
- IVIG (intravenous immunoglobulin) + aspirin within 10 days of illness onset dramatically reduces aneurysm risk.
- Echocardiogram is essential to assess coronary involvement — even in cases without clear aneurysm clinically.
25%
of untreated Kawasaki disease children develop coronary artery aneurysms
Source: AAP
5 days
of fever — minimum duration before Kawasaki diagnosis is considered
Source: AAP
5%
risk of coronary aneurysms even with IVIG treatment — lifelong monitoring needed
Source: Lancet
"Kawasaki disease is a diagnosis I make clinically before any test returns. Five days of fever in a child under 5 with red eyes, cracked lips, and a rash — I start IVIG the same day. Waiting for all five criteria to appear means the window for coronary protection may have closed."
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:
- Conjunctival injection: Both eyes red without discharge (bilateral non-exudative conjunctivitis)
- Oral changes: Strawberry tongue (red, enlarged papillae), cracked red lips, diffuse redness of the oral mucosa
- Rash: Polymorphous rash (variable — macular, maculopapular, or targetoid) on the trunk. Notably, it is NOT vesicular
- 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)
- 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.
Dr. Sushma B
DNB Paediatrics · Fellowship PICU · Sri Anand CNC, Chanda Nagar Hyderabad · Sri Anand Child and Neuro Center
MD Paediatrician with 10+ years of clinical experience in child health, vaccination, developmental paediatrics, and newborn care. Practices at Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad.
References & Sources
- 1.Kawasaki Disease — NCBI StatPearls — NCBI StatPearls
- 2.Kawasaki Disease — NHS — NHS UK
- 3.Kawasaki Disease — NIH MedlinePlus — NIH MedlinePlus
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