# Stage 4 — Generate solutions. The 3-year-old child (14 kg) is on day 6 of fever. The echocardiogram shows a left anterior descending coronary artery Z-score of 2.7, other coronary Z-scores below 2, and normal ventricular function. Platelets are 522,000/mm3. IVIG 2 g/kg and aspirin are prescribed. Which interventions should the nurse anticipate in the current plan? Select all that apply.

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> language: en  
> subject: Parenteral/IV Therapies  
> category: PPT

## Question

Stage 4 — Generate solutions. The 3-year-old child (14 kg) is on day 6 of fever. The echocardiogram shows a left anterior descending coronary artery Z-score of 2.7, other coronary Z-scores below 2, and normal ventricular function. Platelets are 522,000/mm3. IVIG 2 g/kg and aspirin are prescribed. Which interventions should the nurse anticipate in the current plan? Select all that apply.

1Report fever of 38.0 C or higher 36 hours or more after IVIG
2Give the nasal-spray influenza vaccine before discharge
3Switch to low-dose aspirin as soon as the IVIG infusion ends
4Prepare for warfarin because a coronary aneurysm is present
5Give the IVIG as one infusion with frequent vital signs
6Plan a repeat echocardiogram within 1 to 2 weeks
7Give the prescribed aspirin every 6 hours; watch for bleeding
8Substitute a steroid course for IVIG given the coronary finding

## Explanation

The plan includes a single IVIG infusion with close monitoring, moderate- or high-dose aspirin every 6 hours with bleeding surveillance, early repeat echocardiography, and reporting fever that persists or recurs 36 hours or more after IVIG (possible IVIG resistance). A Z-score of 2.7 is a small aneurysm, which does not call for warfarin; aspirin stays at the higher dose until the child is afebrile for 48 to 72 hours; LAIV is contraindicated with aspirin; and corticosteroids may be added to IVIG in high-risk children but do not replace it.

## In-depth explanation

Quick answer
Anticipate the single IVIG infusion with vital signs, aspirin every 6 hours with bleeding surveillance, repeat echocardiography within 1 to 2 weeks, and reporting fever at least 36 hours after IVIG (1, 5, 6, 7).

Why this is correct
Standard initial therapy is IVIG 2 g/kg as a single infusion plus moderate- or high-dose aspirin. Because an LAD Z-score of 2.7 is already abnormal, early and repeated echocardiography tracks progression. Fever of 38.0 C or more that persists or returns at least 36 hours after completion of IVIG defines IVIG resistance and requires prompt reporting because it predicts coronary progression.

Easy analogy or mental picture
Treat the fire with IVIG and aspirin, then keep checking the wiring (the coronaries) and watch for smoke returning (fever after 36 hours).

Memory hook
Z-score ladder: under 2 normal, 2 to under 2.5 dilation, 2.5 to under 5 small, 5 to under 10 medium, 10 or more large (anticoagulate).

NCLEX decision rule
Let the numeric data choose the intensity of therapy: match anticoagulation to aneurysm size, aspirin dose changes to fever status, and fever reporting to the defined time after IVIG.

Why the other choices are wrong
Early low-dose aspirin is tempting because low-dose aspirin is the long-term plan, but the switch occurs after the child has been afebrile for 48 to 72 hours, not when the infusion ends. Warfarin is tempting because an aneurysm is present, but systemic anticoagulation is reserved for large or giant aneurysms, not a Z-score of 2.7. Influenza vaccination is appropriate, but the live nasal spray is contraindicated in children receiving aspirin because of Reye syndrome risk; the inactivated injection is used. Corticosteroids may be considered with IVIG in high-risk children, but substituting them for IVIG is not standard therapy.

References
1AHA Scientific Statement: Diagnosis, Treatment, and Long-Term Management of Kawasaki DiseaseIVIG 2 g/kg single infusion with aspirin, Z-score aneurysm classification, IVIG resistance definition (fever at least 36 hours after IVIG), echocardiography timing, anticoagulation for large aneurysms, and LAIV avoidance with aspirin

## Clinical scenario

Case update
IVIG and aspirin are prescribed after echocardiography shows a left anterior descending coronary Z-score of 2.7.

## Key concepts

- **Coronary Z-score** — A coronary artery diameter adjusted for body surface area; values of 2.5 to under 5 indicate a small aneurysm.
- **IVIG resistance** — Persistent or recurrent fever at least 36 hours after completion of IVIG, which increases coronary risk and prompts additional therapy.
- **Reye syndrome** — Acute liver and brain injury associated with aspirin use during influenza or varicella infection in children.

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