Kawasaki Disease: Nursing Care, Diagnosis, and Treatment

Kawasaki disease is a leading cause of acquired heart disease in children, and prompt recognition and treatment are essential to prevent coronary artery complications. This note reviews the clinical features, diagnostic criteria, phases, treatment, and nursing priorities that nursing students must know.

Definition

• Kawasaki disease (KD) is an acute, self-limited systemic vasculitis of unknown etiology that primarily affects children under 5 years of age.
• It is the most common cause of acquired heart disease in children in developed countries.
• The disease causes inflammation of medium-sized blood vessels, with a predilection for the coronary arteries.
• Without treatment, approximately 25% of children develop coronary artery aneurysms.

Clinical Features: CRASH and Burn Mnemonic

• C — Conjunctivitis: Bilateral, non-exudative redness of the eyes.
• R — Rash: Polymorphous, non-vesicular rash on the trunk and extremities. Perineal rash is a classic early finding.
• A — Adenopathy: Cervical lymphadenopathy (>1.5 cm), typically unilateral.
• S — Strawberry Tongue: Oral mucosal changes with red, cracked lips and a red, swollen tongue with prominent papillae.
• H — Hands and Feet Changes: Erythema and edema of palms and soles in the acute phase, followed by periungual desquamation (peeling) in the subacute phase.
• Burn — Fever: Fever lasting at least 5 days, often >39°C (102.2°F), and unresponsive to antipyretics.

Diagnostic Criteria

• Fever for ≥5 days PLUS at least 4 of the 5 CRASH criteria (Conjunctivitis, Rash, Adenopathy, Strawberry tongue/oral changes, Hands/feet changes).
• Incomplete Kawasaki disease: Fever with fewer than 4 criteria. These children are still at risk for coronary artery complications and require treatment.

Phases of Kawasaki Disease

Acute Phase (Days 1–10)

• High fever, conjunctivitis, rash, red cracked lips, strawberry tongue, edema of hands and feet, and irritability.

Subacute Phase (Days 10–25)

• Fever subsides.
• Desquamation (peeling) of fingers and toes.
• Arthritis and thrombocytosis.
• Highest risk for coronary artery aneurysms.

Convalescent Phase (Days 26–40)

• Symptoms resolve; laboratory values normalize (ESR may remain elevated).

Treatment

• Intravenous immunoglobulin (IVIG) is the mainstay of treatment.
  • Given as a single infusion, ideally within the first 10 days of illness.
  • Reduces the risk of coronary artery aneurysms by 80–90%.
• High-dose aspirin for anti-inflammatory and antiplatelet effects.
  • Acute phase: 80–100 mg/kg/day in 4 divided doses.
  • After fever resolves: reduce to 3–5 mg/kg/day once daily for antiplatelet effect.
• Live vaccines and IVIG: IVIG can blunt the immune response to live virus vaccines. Delay MMR and varicella vaccines for 11 months after IVIG administration.

Nursing Interventions

• Monitor vital signs frequently. Assess for signs of cardiac involvement (tachycardia, gallop rhythm, murmur, changes in perfusion).
• Monitor for IVIG reactions during infusion: hypotension, facial flushing, chest tightness, anaphylaxis.
• Administer aspirin as ordered. Monitor for bleeding (GI bleeding, easy bruising) and signs of Reye syndrome (vomiting, confusion, lethargy).
• Skin and oral care: Apply moisturizer to dry, peeling skin; petroleum jelly to cracked lips; gentle oral care with a soft toothbrush and saline rinses.
• Maintain comfort: Keep the child calm and rested to reduce cardiac workload; provide a quiet, low-stimulation environment.
• Monitor fluid balance: Encourage small, frequent feeds of high-calorie foods and fluids; strict I&O monitoring.
• Assess extremities for swelling, redness, and progression of desquamation.
• Parent education: Teach parents to recognize signs of carditis (chest pain, shortness of breath, fatigue), monitor for bleeding, and emphasize the importance of follow-up echocardiograms.
• Emotional support: The illness is prolonged and frightening; provide clear explanations to child and family.

Complications

• Coronary artery aneurysms — the most serious complication, occurring in 25% of untreated children. Can lead to thrombosis, myocardial infarction, and sudden death.
• Myocarditis and pericarditis in the acute phase; can cause heart failure and arrhythmias.
• Thrombocytosis in the subacute phase increases risk of thrombosis.
• Arthritis in the subacute phase — usually self-limiting.

Exam Traps

• Do NOT use antibiotics — Kawasaki is a vasculitis, not an infection.
• Do NOT delay IVIG beyond 10 days — coronary aneurysm risk rises with delay.
• Do NOT rely on ibuprofen or acetaminophen alone for fever — they do not treat the underlying inflammation or prevent coronary complications.
• Do NOT give live vaccines for 11 months after IVIG.
• Do NOT confuse KD with scarlet fever (group A Strep) — KD has no exudative pharyngitis, and antibiotics do not treat it.

Key Takeaways

• Diagnose with fever ≥5 days + 4 of 5 CRASH criteria; treat incomplete KD the same way.
• IVIG within 10 days plus high-dose aspirin is the standard therapy — it dramatically reduces coronary artery aneurysm risk.
• The subacute phase carries the highest risk for coronary aneurysms and features desquamation and thrombocytosis.
• Monitor for IVIG infusion reactions, bleeding, and Reye syndrome with aspirin therapy.
• Delay live vaccines (MMR, varicella) for 11 months after IVIG.
• Kawasaki is the most common cause of acquired heart disease in children in developed countries — follow-up echocardiograms are essential.