![\"Kawasaki](\"https:\/\/www.diginerve.com\/blogs\/wp-content\/uploads\/2026\/06\/Picture1-300x270.png\")
<\/p>\nIn this case, the echocardiographic finding is not merely \u201ccoronary dilatation\u201d; an LAD Z-score of +2.8 falls into the small coronary artery aneurysm category. This distinction is important for NEET SS because Kawasaki disease is the most common cause of acquired heart disease in children in developed countries, and coronary artery aneurysm is its most important complication.<\/p>\n
Arjun, a previously healthy 4-year-old boy, is brought to the paediatric emergency because fever has persisted despite antipyretics. Through this case, we will approach history, examination, investigations, differential diagnosis, incomplete Kawasaki disease, acute management, IVIG resistance, coronary Z-score interpretation, and NEET SS-focused MCQs.<\/p>\n
\u201cMy son has had a fever for 6 days. His eyes look very red, his lips are dry and cracked, his tongue is bright red, and there is a swelling on one side of his neck. He also has a red rash over his body, and his hands and feet look swollen.\u201d<\/p>\n
Arjun, a 4-year-old boy, is brought by his mother to the Paediatric Emergency Department of a tertiary care centre.<\/p>\n
Fig1.<\/p>\n
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Fig2.<\/p>\n
![\"Kawasaki](\"https:\/\/www.diginerve.com\/blogs\/wp-content\/uploads\/2026\/06\/Picture2-300x220.png\")
<\/h2>\nQ1. When did the fever start, and how high has it been?<\/strong> Q2. Did you notice redness of the eyes? Was there discharge?<\/strong> Q3. When did the rash appear, and where did it start?<\/strong> Q4. What changes did you notice in the mouth?<\/strong> Q5. Tell me about the neck swelling.<\/strong> Q6. Any cough, cold, vomiting, diarrhoea, joint pain, or drowsiness?<\/strong> Q7. Any recent illness, drug intake, sick contact, or travel?<\/strong> Clinical Teaching Point:<\/strong> In a fever with rash and conjunctival congestion, vaccination history is essential because measles is an important differential. However, bilateral non-purulent conjunctivitis, oral mucosal inflammation, extremity oedema, cervical lymphadenopathy, and sterile inflammatory markers strongly favour Kawasaki disease.<\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n Coronary artery assessment is central to diagnosis, risk stratification, and follow-up. A Z-score of +2.8 should be classified as a small coronary artery aneurysm, not merely coronary dilatation.<\/p>\n <\/p>\n Classic Kawasaki Disease with Small Left Anterior Descending Coronary Artery Aneurysm, LAD Z-score +2.8.<\/p>\n This is classic Kawasaki disease because the child has fever for \u22655 days with all five principal clinical criteria: bilateral non-exudative conjunctivitis, oral mucosal changes, polymorphous rash, extremity changes, and cervical lymphadenopathy. The echocardiographic LAD Z-score of +2.8 confirms small coronary artery aneurysmal involvement, rather than simple coronary dilatation. For NEET SS, this case is high yield because diagnosis is clinical, but risk stratification and follow-up depend heavily on coronary Z-score classification.<\/p>\n \u00a0<\/strong><\/p>\n Admit the child for close paediatric and cardiac monitoring. Start intravenous immunoglobulin, IVIG 2 g\/kg IV as a single infusion over 10\u201312 hours<\/strong>. For Arjun, weighing 16 kg, the total dose is 32 g IV once<\/strong>. Monitor temperature, heart rate, blood pressure, urine output, infusion reactions, and clinical features of myocarditis or cardiac failure.<\/p>\n ASPIRIN DOSE:<\/strong> Avoid ibuprofen because it may interfere with aspirin\u2019s antiplatelet action. Monitor for gastrointestinal irritation, hepatic dysfunction, bleeding tendency, and symptoms suggestive of salicylate toxicity.<\/p>\n
\nAns –<\/strong> The fever started 6 days ago and has been present every day. It is usually high-grade, around 102\u2013103\u00b0F and comes down only partially after paracetamol. He becomes irritable whenever the fever rises.<\/p>\n
\nAns –<\/strong> Both eyes became red from the third day of fever. There is no sticky discharge, no pus, and his eyelids are not stuck together in the morning.<\/p>\n
\nAns –<\/strong> The rash appeared on the fourth day. It started over the trunk and then involved the limbs. It is red and patchy. There are no blisters, no blackish spots, and he is not scratching it much.<\/p>\n
\nAns –<\/strong> His lips became very red and cracked. His tongue looks unusually red and rough. He is drinking less because his mouth appears sore.<\/p>\n
\nAns –<\/strong> The swelling appeared 2 days ago on the right side of the neck. It is tender, about 2 cm in size, and there is no pus discharge.<\/p>\n
\nAns –<\/strong> There is no cough, no significant cold, no repeated vomiting, no joint swelling, no drowsiness, and no seizures. He passed loose stool once but is otherwise passing urine.<\/p>\n
\nAns –<\/strong> There is no recent travel, no similar illness in school or at home, and no new medicine apart from paracetamol.<\/p>\nOther Parts of History<\/h2>\n
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\n Label<\/strong><\/td>\n Content<\/strong><\/td>\n<\/tr>\n \n Past Medical History<\/td>\n Previously healthy; no congenital heart disease, recurrent infections, or autoimmune disorders.<\/td>\n<\/tr>\n \n Drug History<\/td>\n Has taken only oral paracetamol; no antibiotics, anticonvulsants, sulfonamides, or other new medications.<\/td>\n<\/tr>\n \n Vaccination History<\/td>\n Immunisations are up to date for age, including the measles vaccine.<\/td>\n<\/tr>\n \n Family History<\/td>\n No family history of vasculitis, autoimmune disease, recurrent fever syndromes, or early coronary disease.<\/td>\n<\/tr>\n \n Social History<\/td>\n School-going child living with parents and a sibling; the sibling is well, and there is no fever or rash at home.<\/td>\n<\/tr>\n \n Allergy History<\/td>\n No known drug allergies.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Important Diagnoses to Rule Out Before Examination<\/h2>\n
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\n Diagnosis<\/strong><\/td>\n Why it must be considered, and what would clinch it<\/strong><\/td>\n<\/tr>\n \n Bacterial sepsis\/meningococcaemia<\/strong><\/td>\n High-grade fever with rash can indicate invasive bacterial disease; toxic appearance, shock, purpura, altered sensorium, or positive cultures would clinch it.<\/td>\n<\/tr>\n \n Measles<\/strong><\/td>\n Fever, conjunctival redness, mucosal involvement, and rash overlap; cough-coryza-conjunctivitis, Koplik spots, cephalocaudal rash, and incomplete immunisation would support measles.<\/td>\n<\/tr>\n \n Scarlet fever<\/strong><\/td>\n Fever, rash, and strawberry tongue may mimic Kawasaki disease; exudative tonsillitis, sandpaper rash, Pastia lines, and streptococcal evidence would favour it.<\/td>\n<\/tr>\n \n Systemic JIA<\/strong><\/td>\n Prolonged fever with rash may resemble inflammatory vasculitis; quotidian fever, evanescent salmon-pink rash, arthritis, hepatosplenomegaly, and hyperferritinaemia would support it.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Clinical Examination<\/h2>\n
Part A \u2014 Vitals<\/strong><\/h3>\n
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\n Parameter<\/strong><\/td>\n Value<\/strong><\/td>\n Interpretation<\/strong><\/td>\n<\/tr>\n \n Temperature<\/td>\n 39.2\u00b0C<\/td>\n Persistent high-grade fever<\/td>\n<\/tr>\n \n Heart rate<\/td>\n 138\/min<\/td>\n Tachycardia, partly fever-related<\/td>\n<\/tr>\n \n Respiratory rate<\/td>\n 28\/min<\/td>\n Mild tachypnoea<\/td>\n<\/tr>\n \n Blood pressure<\/td>\n 92\/58 mmHg<\/td>\n Preserved perfusion; no shock<\/td>\n<\/tr>\n \n SpO\u2082<\/td>\n 99% on room air<\/td>\n Normal oxygenation<\/td>\n<\/tr>\n \n Weight<\/td>\n 16 kg<\/td>\n Required for IVIG and aspirin dose calculation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Part B \u2014 Systemic Examination<\/strong><\/h3>\n
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AHA Criteria Checklist:<\/strong><\/h3>\n
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Investigations<\/h2>\n
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\n Test<\/strong><\/td>\n Result<\/strong><\/td>\n Normal Range<\/strong><\/td>\n Clinical Significance<\/strong><\/td>\n<\/tr>\n \n Haemoglobin<\/td>\n 10.8 g\/dL<\/td>\n 11.5\u201313.5 g\/dL<\/td>\n Mild anaemia of inflammation<\/td>\n<\/tr>\n \n Total leukocyte count<\/td>\n 17,800\/mm\u00b3<\/td>\n 5,000\u201315,000\/mm\u00b3<\/td>\n Neutrophilic leukocytosis<\/td>\n<\/tr>\n \n Platelet count<\/td>\n 5.8 lakh\/mm\u00b3<\/td>\n 1.5\u20134.5 lakh\/mm\u00b3<\/td>\n Thrombocytosis; classically prominent after the first week<\/td>\n<\/tr>\n \n ESR<\/td>\n 82 mm\/hr<\/td>\n <20 mm\/hr<\/td>\n Significant systemic inflammation<\/td>\n<\/tr>\n \n CRP<\/td>\n 96 mg\/L<\/td>\n <5 mg\/L<\/td>\n Markedly elevated; risk marker for severe inflammation<\/td>\n<\/tr>\n \n Serum albumin<\/td>\n 2.8 g\/dL<\/td>\n 3.5\u20135.0 g\/dL<\/td>\n Hypoalbuminaemia: a poor prognostic marker<\/td>\n<\/tr>\n \n Serum sodium<\/td>\n 132 mmol\/L<\/td>\n 135\u2013145 mmol\/L<\/td>\n Mild hyponatraemia associated with an inflammatory burden<\/td>\n<\/tr>\n \n ALT<\/td>\n 86 IU\/L<\/td>\n <40 IU\/L<\/td>\n Hepatic inflammatory involvement<\/td>\n<\/tr>\n \n Urine routine<\/td>\n Sterile pyuria<\/td>\n Absent<\/td>\n Supports Kawasaki disease when the urine culture is negative<\/td>\n<\/tr>\n \n 2D echocardiography<\/strong><\/td>\n LAD coronary artery Z-score +2.8<\/strong><\/td>\n Z-score <+2.0<\/strong><\/td>\n Small coronary artery aneurysm; most important baseline investigation<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n AHA-style Z-score interpretation:<\/strong><\/h2>\n
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\n Coronary Z-score<\/strong><\/span><\/td>\n Interpretation<\/strong><\/span><\/td>\n<\/tr>\n \n <2.0<\/td>\n No coronary involvement<\/td>\n<\/tr>\n \n 2.0 to <2.5<\/td>\n Dilatation only<\/td>\n<\/tr>\n \n \u22652.5 to <5.0<\/td>\n Small coronary artery aneurysm<\/td>\n<\/tr>\n \n \u22655.0 to <10.0<\/td>\n Medium coronary artery aneurysm<\/td>\n<\/tr>\n \n \u226510.0 or absolute dimension \u22658 mm<\/td>\n Giant coronary artery aneurysm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Diagnosis<\/h2>\n
Differentials Explained \u2014 Why Each Was Ruled Out<\/h2>\n
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\n Differential<\/strong><\/td>\n Features Suggesting It<\/strong><\/td>\n Features Against It<\/strong><\/td>\n Verdict<\/strong><\/td>\n<\/tr>\n \n Viral exanthem, EBV \/ adenovirus<\/td>\n Fever, rash, conjunctival redness<\/td>\n No exudative pharyngitis, no hepatosplenomegaly, small LAD coronary aneurysm present<\/strong><\/td>\n RULED OUT<\/td>\n<\/tr>\n \n Bacterial lymphadenitis<\/td>\n Tender unilateral cervical lymph node<\/td>\n Multisystem mucocutaneous findings and sterile pyuria favour KD<\/td>\n RULED OUT<\/td>\n<\/tr>\n \n Scarlet fever<\/td>\n Fever, rash, strawberry tongue<\/td>\n No exudative tonsillitis, no sandpaper rash, no Pastia lines<\/td>\n RULED OUT<\/td>\n<\/tr>\n \n Stevens-Johnson syndrome<\/td>\n Fever with mucosal involvement<\/td>\n No target lesions, bullae, epidermal necrolysis, or drug trigger<\/td>\n RULED OUT<\/td>\n<\/tr>\n \n Systemic JIA<\/td>\n Prolonged fever and rash<\/td>\n No arthritis, no quotidian fever, rash not salmon-pink or evanescent<\/td>\n RULED OUT<\/td>\n<\/tr>\n \n Kawasaki Disease<\/td>\n Fever \u22655 days, all AHA criteria, high inflammatory markers, LAD Z-score +2.8 small coronary aneurysm<\/strong><\/td>\n No stronger alternative diagnosis<\/td>\n CONFIRMED<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Management<\/h2>\n
Phase 1 \u2014 Acute Phase: First 24\u201348 Hours<\/strong><\/h3>\n
\nStart aspirin 30\u201350 mg\/kg\/day orally in 4 divided doses<\/strong> during the acute febrile inflammatory phase. For a 16 kg child, this corresponds to a total daily dose of 480\u2013800 mg\/day<\/strong>, divided every 6 hours, approximately 120\u2013200 mg per dose every 6 hours<\/strong>.<\/p>\nPhase 2 \u2014 Subacute Phase: After Fever Resolution<\/strong><\/h3>\n
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