In Kawasaki disease, coronary artery aneurysm is diagnosed when the median internal diameter is greater than:

NORCET 9 Mains - 2025

Child Health Nursing (Pediatrics)

Easy

Appeared in: NORCET 9 Mains - 2025

Explanation

The diagnosis of a coronary artery aneurysm (CAA) in Kawasaki disease is based on age-specific measurements of the artery's internal diameter.
For children under 5 years old, who are the most commonly affected group, an aneurysm is diagnosed when the internal diameter is greater than 3 mm.
Since the question does not specify the child's age, the standard threshold for the most prevalent age group is considered the correct answer.
This value is used as a cutoff because the normal size of coronary arteries is smaller in younger children.

Option A: A diameter of 2 mm is generally within the normal range for young children and would not typically be classified as an aneurysm, although it might represent mild dilation (a z-score greater than 2).
Option C: This is the correct diagnostic threshold, but for a different age group.
Option D: A diameter of 5 mm indicates a more significant aneurysm, not the initial diagnostic threshold. According to AHA guidelines, this would be classified as a medium-sized aneurysm.

Visual 1: Diagram - An illustration comparing a normal coronary artery to one with a saccular aneurysm, clearly highlighting the increased internal diameter.
Visual 2: Echocardiogram - An annotated echocardiogram image showing a dilated coronary artery in a child with Kawasaki disease, with measurement calipers indicating a diameter greater than 3 mm.

Clinical Relevance

Nursing practice connection: Knowing Diagnostic criteria for coronary artery aneurysm in Kawasaki disease helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a critical role in the early identification of Kawasaki disease signs (fever, rash, conjunctivitis, etc.) to facilitate prompt treatment with IVIG, which significantly reduces the risk of CAA.
Accurate monitoring and documentation of fever patterns, intake/output, and daily weights are essential nursing responsibilities during the acute phase.
Patient and family education is vital, focusing on the importance of follow-up echocardiograms to monitor for cardiac complications and recognizing signs of potential issues like heart failure or thrombosis.

How to Approach the Question

Step 1: Identify the core of the question. It asks for a specific numerical value used to diagnose a complication (aneurysm) in a specific pediatric disease (Kawasaki).
Step 2: Recognize that clinical values in pediatrics are often context-dependent, especially those related to growth and size. In this case, the size of a child's artery depends on their age.
Step 3: Recall or deduce the most common context for the disease. Kawasaki disease primarily affects children under 5 years old.
Step 4: Apply the standard value for that primary demographic. The diagnostic threshold for coronary artery aneurysm in children under 5 is an internal diameter greater than 3 mm.
Step 5: Evaluate the given options based on this knowledge. The option '3 mm' directly corresponds to this standard criterion.

Concept Tested & Keywords

Concept Tested: Diagnostic criteria for coronary artery aneurysm in Kawasaki disease.
Stem keywords: Kawasaki disease, coronary artery aneurysm, median internal diameter
Lead-in keywords: greater than
Negative lead-in flag: false

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