Kawasaki disease

KAWASAKI DISEASE
DEFINITION,C/F,DX,
COMPLICATION &
TREATMENT
Mod – Dr. D. Singh
Co-Mod – Dr. Sumidha Mittal
By – Dr. Aftab Ahmad

CONTENTS
• HISTORY
• DEFINITION
• EPIDEMIOLOGY
• PATHOGENESIS
• CLINICAL FEATURES
• DIAGNOSIS
• DIFFERENTIAL DIAGNOSIS
• COMPLICATION
• TREATMENT
• QUESTION

QUESTIONS ASKED IN DNB
• 1. Kawasaki Syndrome 15
• 2. Phases and complications of Kawasaki’s disease 10
• 3. Discuss the presentation, diagnostic criteria for Kawasaki Disease. What is
the management strategy? What are the complications? 10
• 4. Discuss the pathogenesis, differential diagnosis and echocardiography
findings in Kawasaki Disease (KD). How is the classical KD different from
Atypical KD? 6+4
• 5. Describe clinical manifestations of classical and atypical Kawasaki disease.
Provide algorithmic approach to a suspected case of Kawasaki disease.
Enumerate various treatment modalities. 4+4+2
• 6. Enumerate diagnostic criteria of Kawasaki disease. Briefly outline its
management and enumerate complications. 4+4+2
• 7. Diagnostic criteria for Kawasaki Disease. Short note

HISTORY
1967 - Tomisaku Kawasaki reports a series of 50
patients and establishes the clinical criteria for
diagnosis (in Japanese)
1974 - first English language report of Kawasaki
syndrome by Kawasaki
1976 - first series of American patients reported by
Melish, Hawaii
1977 - landing and Larson establish that Kawasaki
disease and infantile polyarteritis nodosa are
pathologically indistinguishable
1988 - American academy of pediatrics endorses
high does IVIG plus ASA as recommended therapy
for Kawasaki disease

INTRODUCTION
• Also known as mucocutaneous lymph node syndrome and infantile
polyarteritis nodosa.
• It is an acute febrile illness of childhood seen worldwide with the
highest incidence occurring in Asian children.
• KD is a vasculitis affecting medium size vessels
• Coronary artery aneurysms or ectasia develop in 20% to 25% of
untreated children & can lead to
 ischemic heart disease or
 sudden death

EPIDEMIOLOGY
 More prevalent in Japan and in children of Japanese ancestry
(annual incidence of 112 cases per 100 000 children <5 years old)
 Age of onset -
 Peak age - 2 to 5 yrs
 80 - 85 % < 5 yrs
 Rare > 18 yrs

ETIOLOGY & PATHOGENESIS
 Etiology of KD remains unknown, (although clinical and
epidemiological features strongly suggest an infectious cause)
 Hypothesis - KD is caused by a ubiquitous infectious agent that
produces clinically apparent disease only in certain genetically
predisposed individuals, particularly Asians

 Its rarity in the first few months < 3m of life and in adults suggests an
agent to which the adults are immune and from which very young infants
are protected by passive maternal antibodies
 Little evidence exists of person-to-persontransmission
 Hypothesis assumes that most infected childrenexperience asymptomatic
infection with only a small fraction developing overt clinical features of
Kawasaki disease
 A genetic role in the pathogenesis of KD seems likely, as evidenced by the
higher risk of KD in Asian children regardless of country of residence

PATHOLOGY
• KD is a vasculitis that predominantly affects the medium-size arteries.
• The coronary arteries are the most commonly involved, although
other arteries, such as the popliteal and brachial arteries, can also
develop dilation.
• A 3-phase process to the arteriopathy of KD are
• 1st phase - neutrophilic necrotizing arteritis in the 1st 2 wk of illness
Saccular aneurysms may form from this arteritis.
• 2nd phase – subacute/chronic vasculitis driven by lymphocytes,
plasma cells, and eosinophils, which may last weeks to years and
results in fusiform aneurysms.

• 3rd phase - smooth muscle cell myofibroblasts develop which causes
progressive stenosis. Thrombi may form in the lumen and obstruct
blood flow.

Clinical Features
• Prolonged fever – usually > 5 days duration
• At least 4 of the following 5 features
• 1 – bilateral nonexudative conjunctival injection with limbal sparing
• 2 – erythema of the oral and pharyngeal mucosa with strawberry
tongue and red, cracked lips
• 3 – edema and erythema of the hands and feet
• 4 – polymorphic rash usually truncal
• 5 – nonsuppurative cervical lymphadenopathy, usually unilateral, with
node size >1.5 cm

Fever in KD
• Fever is characteristically high (≥38.3°C [101°F]), unremitting, and
unresponsive to antibiotics.
• The duration of fever without treatment is generally 1-2 wk, but may
persist for 3-4 wk.
• Defervescence within 1-2 days of treatment with IVIG

Conjunctivitis in KD
Begins shortly after the fever
Resolves promptly - may have
disappeared by presentation
Non-purulent conjunctival
injection
Bulbar conjunctivitis with limbic
sparing
Anterior uveitis may occur (in up
to 80%)

Oropharyngeal changes
Erythema, dryness, swelling and
peeling of lips - lipstick sign
Lips may bleed
Erythema of oropharyngeal
mucosa
Strawberry tongue
No Koplik’s spots or oral
ulceration or exudates in KD

Changes in the extremities
Oedema of hands and feet,
especially in infants
Peeling of fingers and toes
(often periungual) is NOT a
feature of the acute presentation
Peeling of hands and feet in sub
acute phase (1-2 weeks)
Beau’s lines in nails;
occasionally nail is lost

Polymorphous rash
Generally occurs with onset of fever and fades within a week
Morbilliform rash or erythematous plaques at flexor creases
Erythema and desquamation of the inguinal/perineal area
Occurs early (desquamation of hands and feet is a later sign)
The presence of - petechiae or purpura, vesicles or bullae,
crusting, pruritis - search for an alternative diagnosis

Lymphadenopathy in KD
50-80% of cases
>1.5cm, usually more obvious
May be unilateral single node
May be erythematous, but non-fluctuant and no pus

Other clinical features or KD
• Irritability
• Aseptic meningitis (~25% ) (CSF - ↑ lymph's, N glucose/protein)
• Arthritis - probably less common since IVIG treatment
• Hydrops of the gallbladder (RUQ pain, seen on USS)
• Sterile pyuria, urethritis and diarrhoea
• Pulmonary infiltrates or pneumonitis
• Inflammation at site of BCG scar
• Cross-reactivity of T cells in KD patients between specific epitopes of
Mycobacterial and human heat shock proteins

• Cardiac involvement
a. Myocarditis – manifests as tachycardia disproportionate to fever, along
with diminished left ventricular systolic function.
b. Cardiogenic shock (KD shock syndrome) – with markedly diminished left
ventricular function
c. Pericarditis with a small pericardial effusion can also occur during the
acute illness.
d. Mitral regurgitation – in 10-25% of patients
e. CAA develop in up to 25% of untreated patients in the 2nd to 3rd wk of
illness.

Atypical and Incomplete KD
Incomplete KD – they have less then 4 clinical criteria along with
fever
Atypical KD – patients who have a problem, such as renal
impairment, that generally is not seen in Kawasaki disease.

• Incomplete KD is more common in young infants
• They have high risk of developing CAD
• Incomplete KD should be considered in all children with unexplained
fever for 5 days associated with 2 or 3 of the principal clinical features
of KD
• ECHO should be considered in any infant aged 6 months with fever of
7 days’ duration, lab evidence of systemic inflammation, and no other
explanation for the febrile illness.

Clinical phase of KD
1. Acute febrile phase - characterized by fever and the other acute
signs of illness and usually lasts 1-2 wk.
2. Subacute phase - is associated with desquamation, thrombocytosis,
the development of CAA, the highest risk of sudden death, it lasts
about 3 wk.
3. Convalescent phase - begins when all clinical signs of illness have
disappeared and continues until the ESR returns to normal, typically
about 6-8 wk after the onset of illness.

Lab Investigations
1) TLC - ↑
2) Hb - ↓
3) Plt - N in 1st wk , ↑in 2nd & 3rd wk
4) ESR - ↑
5) CRP - ↑
6) SGOT & SGPT - ↑
7) Pus cells in urine - ↑
8) CSF pleocytosis - can be +

9) 2 D Echo - lack of normal tapering of the vessels
- Body surface area–adjusted coronary artery dimensions
in the 1st 10 days of illness appear to be good predictors of involvement
during early follow-up.
-Aneurysms have been defined with use of absolute
dimensions by the Japanese Ministry of Health and are classified as
i. small (<5 mm internal diameter)
ii. medium (5-8 mm internal diameter)
iii. giant (>8 mm internal diameter).

• coronary artery dimensions, adjusted for BSA , provide a more
accurate assessment of the size of RCA or LAD as compared with
expected population norms.
• A z score ≥ 2.5 (ie, a coronary dimension that is ≥ 2.5 SDs above the
mean for BSA) is expected to occur in 0.6% of the population without
KD.
• A z score ≥ 3.0 in 1 of these segments would be expected to occur in
0.1% of the population without KD.

Coronary angiogram
Demonstrating giant
aneurysm
of the left anterior descending
coronary artery (LAD) with
obstruction
and giant aneurysm of the
right coronary artery (RCA)
with an area of
severe narrowing in 6 yr old
boy.

• Echocardiography
I. at diagnosis
II. again after 2-3 wk of illness.
III. If the results are normal, a repeat study should be performed 6-8
wk after onset of illness.

Poor prognostic markers
i. young age,
ii. male gender
iii. persistent fever,
iv. poor response to IVIG,
v. laboratory abnormalities - neutrophilia, thrombocytopenia,
transaminitis, hyponatremia, hypoalbuminemia, elevated CRP
levels.
vi. Asian and Pacific Islander race and Hispanic ethnicity

Treatment
• Acute stage : - IVIG 2 gm/kg over 10 – 12 hrs
- Aspirin 80-100 mg/kg/day divided every 6 hr orally
until patient is afebrile for at least 48 hr
• Convalescent Stage : - Aspirin 3-5 mg/kg/day once daily orally until 6-
8 wk after illness onset if normal coronary findings throughout course

• Long term therapy for patient with CAA : -
• Aspirin 3-5 mg/kg once daily orally
• Clopidogrel 1 mg/kg/day (maximum: 75 mg/day)
• Most experts add warfarin or low-molecular-weight heparin for those
patients at particularly high risk of thrombosis
• Acute coronary thrombosis : - Prompt fibrinolytic therapy with tissue
plasminogen activator or other thrombolytic agent under supervision
of a pediatric cardiologist

• IVIG-resistant KD : - occurs in 15% of patients
• Defined by persistent or recrudescent fever 36 hr after completion of
the initial IVIG infusion.
• Patients with IVIG resistance are at increased risk for CAA.
• another dose of IVIG at 2 g/kg is administered to patients with IVIG
resistance.
• TNF inhibitors, including infliximab and etanercept, have also been
given for the treatment

Complications
• small solitary aneurysm – aspirin should be continued indefinitely
• larger or numerous aneurysms – may require the addition of other
antiplatelet agents or anticoagulation (pediatric cardiologist)
• Acute thrombosis – thrombolytic therapy
• Reye syndrome - d/t long-term aspirin therapy
- should receive annual influenza vaccination to
reduce the risk of Reye syndrome.
• MMR and varicella vaccinations should generally be deferred until 11
mo after IVIG administration as IVIG interfere with immune response.

Prognosis
• Prognosis depends upon the status of CAA
• Overall, 50% of CAA regress to normal lumen diameter by 1-2 yr.
• smaller aneurysms being more likely to regress.
• Giant aneurysms are less likely to regress to normal lumen diameter
and are most likely to lead to thrombosis or stenosis.
• CABG may be required if myocardial perfusion is significantly
impaired.
• KD children's have ↑risk of atherosclerotic heart disease in
adulthood

• All children with a history of KD should be counselled regarding
a. heart-healthy diet
b. adequate amounts of exercise
c. tobacco avoidance, and
d. Intermittent lipid monitoring.

HARADA Score
• Harada score is used to determine whether IVIG treatment will be
used.
• IVIG is given to children who fulfill 4 of the following criteria assessed
within 9 days of onset of illness:
• (1) white blood cell count > 12 000/mm3;
• (2) platelet count < 350 000/mm3;
• (3) CRP > 3 +
• (4)hematocrit < 35%; (5) albumin < 3.5 g/dL; (6) age ≤ 12 months; and
• (7) male sex.

• 1. A feature of Kawasaki disease is:
• a.Kawasaki disease is endemic in Japan.
• b.It takes the form of periodic epidemics.
• c.In developing countries, it usually affects infants before 4 mo of age.
• d.It is more common in adults in developed countries

• 2. Mark the incorrect statement:
• a.80% of Kawasaki patients are younger than 5 yr.
• b.It can present with only fever and coronary affection.
• c.IgA plasma cells are prominent in its inflammatory infiltrate.
• d.It is the leading cause of acquired heart disease

• 3. One of the diagnostic criteria of Kawasaki disease is:
• a.Purulent conjunctivitis.
• b.Fever for at least 15 days.
• c.Fissured lips.
• d.Vesicular rash on the extremities.

• 4. Lymphadenopathy of Kawasaki disease is characterized by:
• a.Usually unilateral.
• b.Less than 1.5 cm in diameter.
• c.Commonly axillary.
• d.Very tender.

• 5. Periungual desquamation occurs:
• a.On the 5th day of illness.
• b.After fever subsides.
• c.In untreated cases.
• d.Only if coronary arteries are affected.

• 6. Laboratory results in Kawasaki disease may include:
• a.Thrombocytosis.
• b.Sterile pyuria.
• c.Neutrophilia.
• d.Hypoalbuminemia.
• e.All of the above.

• 7. Echocardiography is indicated in Kawasaki disease:
• a.At onset and then weekly thereafter.
• b.At diagnosis, 2 weeks and then 6 weeks after onset.
• c.At diagnosis, 2 months and then 6 months after onset.
• d.Only if there are ECG changes.

• 8. Intravenous immunoglobulin (IVIG) is given as follows:
• a.400 mg/kg over 10-12 hours.
• b.Two g/kg over 10-12 hours.
• c.One g/kg/day for 5 days.
• d.400 mg/kg/day for 10 days.

• 9. The following are true in the treatment of Kawasaki disease except:
• a.Patients treated with IVIG should have MMR and varicella vaccines
delayed for 11 months.
• b.IVIG in the first 10 days of illness reduces the incidence of coronary
disease.
• c.IVIG should not be given to patients diagnosed after the 10th day of
illness.
• d.Resistance to IVIG therapy is seen in 10% of cases.

• 10. A more severe outcome in Kawasaki disease is expected with:
• a.Male gender.
• b.Younger than one year.
• c.Fever after afebrile period.
• d.Thrombocytopenia.
• e.All of the above.

• 10. The differential diagnosis of Kawasaki disease includes:
• a.Hodgkin disease.
• b.Scarlet fever.
• c.Severe atopic dermatitis.
• d.Takayasu arteritis

Kawasaki disease

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