# Stage 2 — Analyze cues. Complete the statements by choosing the most likely option for each blank.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=617243&lang=en  
> language: en  
> subject: Pathophysiology  
> category: PA

## Question

Stage 2 — Analyze cues. Complete the statements by choosing the most likely option for each blank.

The child has had fever for 6 days despite oral amoxicillin, with bilateral red eyes without discharge, cracked lips and a strawberry tongue, a polymorphous truncal rash, red and swollen hands and feet, and a 1.8-cm unilateral cervical lymph node. There is no vomiting, diarrhea, or known COVID-19 exposure, and the rapid strep test is negative. This presentation meets criteria for ::선택::incomplete Kawasaki diseaseclassic Kawasaki diseasemultisystem inflammatory syndrome in children. With BP 92/54 mm Hg, clear lungs, and SpO2 98% on room air, the complication of greatest concern is ::선택::myocarditis with heart failurepericardial effusion with tamponadecoronary artery aneurysm, which the nurse anticipates will first be evaluated with ::선택::transthoracic echocardiographycoronary CT angiographycardiac catheterization. Because the fever began 6 days ago, IVIG should be given ::선택::after the fever reaches day 10now, within the recommended windowonly if the echocardiogram is abnormal.

## Explanation

Fever for at least 5 days with all five principal features (including a node of at least 1.5 cm) meets criteria for classic, not incomplete, Kawasaki disease, and the absence of GI symptoms, shock, and COVID-19 exposure argues against MIS-C. Normal BP, clear lungs, and normal oxygenation make heart failure or tamponade unlikely, so coronary aneurysm is the key threat; transthoracic echocardiography is the first-line noninvasive coronary study in children, and IVIG is given now, within 10 days of fever onset, without waiting for an abnormal echocardiogram.

## In-depth explanation

Quick answer
Classic Kawasaki disease; coronary artery aneurysm; transthoracic echocardiography; now, within the recommended window.

Why this is correct
Classic Kawasaki disease requires fever for at least 5 days plus at least 4 of 5 principal features; this child has all 5, and the cervical node counts because it is at least 1.5 cm. MIS-C can mimic Kawasaki disease but usually features prominent GI symptoms, shock or ventricular dysfunction, and SARS-CoV-2 exposure, none of which are present. With no hypotension, crackles, or hypoxemia, the complication that shapes treatment is coronary artery dilation or aneurysm. Transthoracic echocardiography measures coronary size noninvasively and is the first-line study in children. IVIG is recommended within the first 10 days of illness, and a normal or pending echocardiogram does not delay treatment of classic disease.

Easy analogy or mental picture
Think of a checklist at the door: count the principal features to decide classic versus incomplete, check the GI tract and blood pressure to turn away MIS-C, then send the child to the least invasive camera that can see the coronaries.

Memory hook
Five features and five days = classic; echo first; IVIG before day 10.

NCLEX decision rule
Use each piece of patient data to separate near-neighbours: the number and size of features classify the diagnosis, vital signs rule hemodynamic complications in or out, and the illness day, not the echo result, determines when classic disease is treated.

Why the other choices are wrong
Incomplete Kawasaki disease is tempting because many children present that way, but it applies when fewer than 4 principal features are present. MIS-C is a real mimic, but the absence of GI symptoms, shock, and COVID-19 exposure makes it unlikely. Myocarditis and pericardial effusion occur in acute Kawasaki disease, but the normal BP, clear lungs, and SpO2 98% show no failure or tamponade. Coronary CT angiography and catheterization do image the coronaries, but they involve radiation, sedation, or invasive access and are reserved for later evaluation of significant aneurysms. Waiting until day 10 misreads the treatment window, and waiting for an abnormal echocardiogram applies the incomplete-disease algorithm to a child who already meets classic criteria.

References
1AHA Scientific Statement: Diagnosis, Treatment, and Long-Term Management of Kawasaki DiseaseDifferential diagnosis, coronary artery abnormalities, echocardiographic evaluation, and IVIG timing within 10 days of illness
2CDC: Kawasaki DiseaseKawasaki disease can damage the coronary arteries and early treatment lowers risk

## Clinical scenario

Case update
The nurse integrates the prolonged fever, examination pattern, and test results to identify the diagnosis and the complication that drives urgent treatment.

## Key concepts

- **Coronary artery aneurysm** — Abnormal dilation of a coronary artery that can lead to thrombosis, myocardial infarction, or sudden death.
- **Transthoracic echocardiography** — Noninvasive ultrasound imaging that measures coronary artery dimensions and ventricular function and is the first-line study in Kawasaki disease.
- **IVIG treatment window** — The recommendation to give intravenous immunoglobulin within the first 10 days of illness to reduce coronary injury.

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