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Kawasaki Disease

NCLEX Review Guide: Infectious Diseases - Kawasaki Disease

Kawasaki Disease Overview

Definition and Characteristics

  • Kawasaki Disease is an acute, systemic vasculitis affecting medium-sized arteries, primarily occurring in children under 5 years old with unknown etiology.
  • It is the leading cause of acquired heart disease in children in developed countries, making early recognition and treatment critical.

Key Points

  • Peak incidence: 6 months to 5 years old
  • More common in Asian populations
  • Can lead to coronary artery aneurysms if untreated

Clinical Manifestations

Classic Diagnostic Criteria

Memory Aid: "CRASH"

  • Conjunctivitis (bilateral, non-purulent)
  • Rash (polymorphous)
  • Adenopathy (cervical lymph nodes >1.5 cm)
  • Strawberry tongue/oral changes
  • Hand and foot changes
  • Fever lasting 5+ days that is high-grade (>101°F) and unresponsive to antibiotics or antipyretics is the hallmark sign.
  • Bilateral conjunctival injection without exudate, often described as "bloodshot eyes" without the typical discharge seen in bacterial infections.
  • Polymorphous rash appears as maculopapular, erythematous patches that can resemble measles, scarlet fever, or erythema multiforme.
  • Oral changes include strawberry tongue, cracked lips, and erythematous oral mucosa without ulcerations.

Clinical Scenario

A 3-year-old presents with 6 days of high fever, red eyes without discharge, swollen hands and feet, and a rash on the trunk. Parents report the child has been irritable and refusing to eat.

Phases of Kawasaki Disease

Three Distinct Phases

Phase Duration Key Features
Acute (Febrile) 1-2 weeks High fever, classic symptoms, extreme irritability
Subacute 2-6 weeks Fever resolves, desquamation of fingers/toes, thrombocytosis
Convalescent 6-8 weeks Symptoms resolve, lab values normalize
  • During the subacute phase, characteristic peeling of skin occurs on fingertips and toes, often in large sheets.
  • Coronary artery complications most likely occur during weeks 2-6, making this the highest risk period for cardiac monitoring.

Treatment and Nursing Management

Primary Treatment Protocol

  1. IVIG (Intravenous Immunoglobulin) 2 g/kg as single dose within 10 days of fever onset
  2. High-dose aspirin initially (30-50 mg/kg/day) divided into 4 doses, or 80-100 mg/kg/day if following older protocols; verify current institutional guidelines.
  3. Transition to low-dose aspirin (3-5 mg/kg/day) once fever resolves for antiplatelet effects
  4. Continuous cardiac monitoring and echocardiograms

Critical Alert

Kawasaki Disease is the ONLY pediatric condition where aspirin is indicated due to its anti-inflammatory and antiplatelet properties. Monitor for signs of Reye's syndrome.

  • IVIG administration should be completed within 10 days of fever onset to reduce risk of coronary artery aneurysms from 25% to 5%.
  • Monitor for IVIG reactions including headache, fever, chills, and rarely anaphylaxis during administration.

Nursing Priorities

  • Frequent vital signs and cardiac monitoring
  • Pain management and comfort measures
  • Family education about long-term follow-up
  • Skin care for desquamation

Complications and Long-term Management

Cardiac Complications

  • Coronary artery aneurysms develop in 15-25% of untreated children and 3-5% of treated children, requiring lifelong cardiac follow-up.
  • Giant aneurysms (>8mm) carry the highest risk for thrombosis, myocardial infarction, and sudden death.

Follow-up Schedule Memory Aid

  • 2 weeks: First echo post-treatment
  • 6-8 weeks: Second echo to assess resolution
  • Annual: Ongoing cardiac surveillance if aneurysms present

Commonly Confused Points

Kawasaki Disease Scarlet Fever Measles
Strawberry tongue, no exudate conjunctivitis Strawberry tongue, pharyngeal exudate Koplik spots, cough, coryza
Hand/foot swelling then desquamation Sandpaper rash, linear petechiae Maculopapular rash head to toe
No response to antibiotics Responds to penicillin Viral, supportive care

Quick Check

□ Can you identify the key difference between Kawasaki conjunctivitis and bacterial conjunctivitis?

□ Do you remember why aspirin is used in Kawasaki Disease despite pediatric Reye's syndrome risk?

Study Tips

NCLEX Success Tips

  • Remember: Kawasaki = Coronary complications - always think cardiac monitoring
  • IVIG within 10 days is crucial for preventing aneurysms
  • Aspirin dosing: High during acute phase, low during recovery
  • Look for irritability in questions - classic Kawasaki behavior

Common Pitfalls

  • Don't confuse with other febrile illnesses - Kawasaki has specific criteria
  • Remember desquamation occurs in subacute phase, not acute
  • IVIG is most effective within 10 days of fever onset, but may still be considered after 10 days if coronary abnormalities are present.

You're mastering complex pediatric conditions! Kawasaki Disease recognition and management could save a child's heart. Keep studying with confidence - every concept you learn makes you a safer, more competent nurse! 🌟

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